Certainly that is the case although it may be not just nephilim spirits, but other dead spirits, see below.
This is reading into the passage.
Ellicott's Commentary on the passage says:
"He gave proof of the new powers of purely spiritual action thus acquired by going off to the place, or state, in which other disembodied spirits were (who would have been incapable of receiving direct impressions from Him had He not Himself been in the purely spiritual condition), and conveyed to them certain tidings: He “preached” unto them. What was the substance of this preaching we are not here told, the word itself (which is not the same as, e.g., in
1Peter 1:25) only means to publish or proclaim like a crier or herald; and as the spirits are said to have been disobedient and in prison, some have thought that Christ went to proclaim to them the certainty of their damnation! The notion has but to be mentioned to be rejected with horror; but it may be pointed out also that in
1Peter 4:6, which refers back to this passage, it is distinctly called a “gospel;” and it would be too grim to call that a gospel which (in Calvin’s words) “made it more clear and patent to them that they were shut out from all salvation!” He broughtgood tidings, therefore, of some kind to the “prison” and the spirits in it. And this “prison” must not be understood (with Bp. Browne, Articles, p. 95) as merely “a place of safe keeping,” where good spirits might be as well as bad, though etymologically this is imaginable. The word occurs thirty-eight times in the New Testament in the undoubted sense of a “prison,” and not once in that of a place of protection, though twice (
Revelation 18:2) it is used in the derived sense of “a cage.”
"What, then, does this tell us about where Jesus was on Holy Saturday? Based on Jesus’s words to the thief on the cross in
Luke 23:43, some Christians believe that after his death, Jesus’s soul went to heaven to be in the presence of the Father. But
Luke 23:43 doesn’t say that Jesus would be in the presence of God; it says he would be in the presence of the thief (“Today
you will be
with me in Paradise”), and based on the Old Testament and Luke 16, it seems likely that the now-repentant thief would be at Abraham’s side, a place of comfort and rest for the righteous dead, which Jesus here calls “Paradise.”
Following his death for sin, then, Jesus journeys to Hades, to the City of Death, and rips its gates off the hinges. He liberates Abraham, Isaac, Jacob, David, John the Baptist, and the rest of the Old Testament faithful, ransoming them from the power of Sheol (
Psalm 49:15;
86:13;
89:48). They had waited there for so long, not having received what was promised, so that their spirits would be made perfect along with the saints of the new covenant (
Hebrews 11:39–40;
12:23)."
http://www.desiringgod.org/articles/he-descended-into-hell
While these two as well as the majority of the Church Fathers and Reformers would see Jesus preaching to all in Sheol both those in Abraham's bosom and those in torment, I made my context clear by stating,:
"We find those who had faith in God, and we find those who were described as the remnant, but where were they after they died? In heaven?"
You didn't address the issue I raised. Even if we take the narrower meaning as you suggest, it does nothing to Jesus telling the man on the cross he would be with him in "paradise" not "heaven."
Many would not consider Abraham or Samuel or the thief on the cross next to Jesus "saved" until they are preached to by Christ and he overcomes deaths reign by the presenting of his offering in the Temple in Heaven that corresponds with the outpouring of the HS on Pentecost.
Point is no one needs to defend the "Judas was saved and lost his salvation" approach to counter OSAS.
Historical treatments of the data for freewill to apostatize, or persevere, and reward going to those that persevere, and examples of the people like Demas and in Heb 6:4 and passages about names "blotted out of the book of life," are traditional methods of defending the arminian/molinist position.