Doing this was suggested at the top of page 2.
" Now close the action and see if you can get the bolt back past the catch point (plus a little) by using the charging handle."
Did you do that? Does it?
If it does NOT come back far enough, then one or more of the 3 things they asked you on the other site could be your problem.
If it DOES, then likely not one of those things.
I thought you determined the bolt catch was locked up, frozen, won't move???? Is so, THAT'S the problem. It's gotta be free and be able to move.