so the scripture Timothy knew from his youth is the Tanakh. I would agree the teachings (properly understood) of the Tanakh are sufficient to equip a man to every good work.
Yes. That is the context. Yet the passage states all scripture. Would you agree that scripture is scripture regardless of when it was God breathed? Is the NT also scripture? Did Paul have an eye to future scripture? The text doesn’t say. It simply says “All Scripture”. I submit that it is a form of the prophetic present. Meaning the passage has application now but it’s fulfillment in the future. Like Isaiah’s suffering servant. It’s Israel in the context yet we also know that this prophecy is fulfilled in Christ.
Isaiah 53:3–5 (ESV): He was despised and rejected by men,
a man of sorrows and acquainted with grief;
and as one from whom men hide their faces
he was despised, and we esteemed him not.
4 Surely he has borne our griefs
and carried our sorrows;
yet we esteemed him stricken,
smitten by God, and afflicted.
5 But he was pierced for our transgressions;
he was crushed for our iniquities;
upon him was the chastisement that brought us peace,
and with his wounds we are healed