Scripture reveals who Christ is, doesn't it? Isn't this the basis upon which doctrine is made? Isn't it our plumbline?
If your opinion is that He chose not to exercise all His divine attributes, though He retained them all, then, while I would disagree a bit, there are other legitimate scholars who would agree that this is a Biblical position. These include Walter Martin, Gordon Fee (though I'm not 100% sure), and Gerald Hawthorne.
The main question, then, for the purposes of this thread, is this what Johnson actually teaches.? For Johnson to explicitly affirm this he'd have to affirm that Jesus retained all His divine attributes yet chose not to exercise them. Such language as the following will not work:
"He emptied Himself of divinity and became a man"
"Jesus had no ability to heal the sick. He couldnt cast out devils, and He had no ability to raise the dead...Jesus so emptied Himself that He was incapable of doing what was required of Him by the Father without the Fathers help" - this is shortened version of the quote supplied very recently.
For a position similar to Martin and Hawthorne, etc. Johnson must affirm that the Word retained all divine attributes while Incarnate yet chose not to use them (either this choice was made pre-incarnate or was a conscious choice during the incarnation). Johnson has explicitly eliminated this choice in the 2nd quote above. This is heretical, for if Jesus were less than fully divine, He'd be less than God.