Paul used the OT as the foretelling of Christ. This is what the Bereans recognized.
But no, I don’t see this as proof for the doctrine of sola scriptura.
I think you are conflating sola scriptura with the final authority of scripture - nothing contrary to scripture. If this is what you mean by sola scriptura then your belief is the same as the Church.
Well; isn't THAT interesting!
I'm glad your church has taught you that; for it is NOT mentioned in Scripture.