I rambled on another thread that Paul may well have looked at "scripture" in the way it was generally by his learned Jewish contempories. The "instruction" came from interpreting the stories found in any books considered scripture in a way that had relevance to them then, living under Roman rule.
They did not use the stories as literal history, but as allegory that they could adapt, sometimes even changing stories to suit, very far from the literal interpretation used by the WT and others.
Of course, we today may not approve of that method of exegesis, which in fact went far deeper than merely looking at scripture as allegory, as Paul showed, they would often pull phrases out of the writings of many men, and then cobble together a teaching from the combination they have put together, a bit like the WT does with random phrases.
But regardless, it is doubtful in the extreme Paul meant Timothy to use scripture as Bible literalists do.