I attend an AOG church, and I know of no such restriction or advice given to pastors on teaching about end-times. Our pastor does teach on the Rapture and on the tribulation, though he is careful not to claim that any view (pre-trib, mid trib or post-trib) is the "correct" one.
I have seen all of those at AOG. I have also heard several different teachings. That just tells me that the local pastor may or may not be up to the task of teaching Revelations.
And that was posted on the AOG website a few years ago, when I was researching bylaws and Statement of Faith issues. It has since been changed.