I do not think that anyone reading that thread and the remarks of Ben and myself would conclude that.It’s abundantly apparent there are no completely satisfactory solutions currently on the table for Galatians 1:19 or for 1 Corinthians 9:5.
Maybe not "completely", but very close to fully determining that "brother(s) of the Lord" means "blood brother(s) of Jesus". And then we have the corroborating evidence from gMark and Josephus ...
Cordially, Bernard