AFAIK anyone in any moon can cancel a whiffed 5a into anything except movement or block during recovery. This includes your main, F-Sion, although I don't see any use for it unless you accidentally whiffed it. Fwara can do 2a5a(whiff)2b against crouchers. Almost everyone can do 5b, slight delay, 2b, for a counter hit setup. Works with most normals. In c/h you could do a reverse beat but you don't need to. It has nothing to do with it, it's a basic counter hit setup. Give them 1-2 frames to press a button and kill them if they do.
Reverse beat pressure doesn't mean anything gameplay wise. Dumb people just use it because the red text appears and read it when they don't actually know what's going on.
Back to the point that you seem to have missed. You described the basis of the offense plan of almost every character in almost every fighting game. You don't need to reverse beat to do it, it's just one of the many ways you can. What do you call 2b, delay, 2c? It's the exact same setup. Whatever normal, delay, whatever normal. Doesn't need to be normals but that's what's used most of the time. That you're doing 2c, delay 2b, instead of the other way around doesn't matter.
Also I think most people use the term when someone whiffs a 2a/5a and dashes back in. Again, doesn't matter that it was a reverse beat. It works the same in any frame advantage situation.