Harley, please, get a grammar book. A Protestant grammar book will do. This is my sentence, which you quote:
We do not see that Timothy knows the New Testament Canon, which as of St. Paul's writing did not exist yet.It parses thus:
We do not see XX ::= Timothy knows the New Testament Canon, which Y
Y ::= as of Z did not exist yet
Z ::= St. Paul's writing
1 Timothy did exist. The canon as of the writing of 1 Timothy did not.
The scripture Timothy knew since his youth did not contain the letter St. Paul wrote to him.
The letter to Timothy is not the entire New Testament canon.
But was Timothy reading from the New Testament? It was your claim earlier that he was not.