Sounds like you're confusing two FG concepts: true 50/50s vs. mixups.
BF2 delayed at range into either the OH or low or the mid is absolutely a mix.
"It's reactable" doesn't make something not a mix. Definition of mix is that it's the same starter but can end in several different outcomes. Sub has mixes too that are also "reactable." Can cancel into slide or end in OH, etc. Doesn't make them not mixes, makes them not true 50/50s though.
It also works at 3/4 screen against advancing opponents, there's no "it's only for projectiles hurr durr" limit except for ones you impose on yourself. Not understanding/utilizing mind games with GB is your own play style limitation, not a limitation of the special.
Most importantly, at least in my opinion, the "hurr durr" is completely unnecessary. While I'm basically unknown, my experience covers numerous majors dating back to MK9. Some people may come to this forum and spew BS for likes, attention, and/or purposes of trolling but that's not the case for everyone here. When I comment on this forum it is backed by all of the aforementioned experience, and while I have never made a splash or a name for myself, it is clear to me what the highest level of NRS fighters looks and feels like. This thread seemingly loses control quite often and quite frankly, we all need a Jax kumbaya moment where we take a step back and relax.
Moving on, I believe what we would be arguing at this point is semantics, but that's not something that I want to entertain. What I can do, is rephrase what I said earlier in the thread: bf2 on block is shenanigans, good for those that don't know the matchup/animation of this, and for last hoorah attempts when behind. It very well may work against some players; I don't doubt that in the slightest. However, I'll repeat myself in saying that if you do that in tournament, you're gonna have a bad time. If you consider it mix, that's fine. Maybe I need to hold that when I said it isn't mix, and that's completely fair. But it's not good mix and that's not something that can really be argued.
It is exceptional for moving in against projectiles, can be used for max range trip guards (mainly with whiffed normals into projectiles), and those in combination with the projectile parry, give GB utility that HD simply doesn't have. It's not great, it's not bad. It's just a solid tool.
We'll probably get to the point where we just agree to disagree, which is fine, but personal attacks/trying to make others look stupid is ridiculous. I simply tried to make a statement backed by TONS of things that I've seen/done playing against the best of the best. We all (at least most of us) main Jax. I think all we're trying to do he is help each other.