I’m not really sure how saying this is disproving anything. Any round can do pilot snipes, any round can kill the engine. The issue is that .50 cals - outside of those lucky cases - have to really on a mechanic that takes extra time, is inconsistent in damage, and inconsistent in even doing any damage, while also not being able to do basically anything to structural components despite how blatantly illogical that is.
Because at best half of the kills he showed weren’t pilot snipes, engine hits, bomb explosions, or fuel explosions - with the majority of the remaining half relying on an inconsistent mechanic that is just straight up worse in every way than how HE shells are modeled.
I-185 (M-71) - Multiple direct hits to the wing spars at a perpendicular angle. I’m glad in the literal most optimal circumstance you can get .50 cals will do structural damage sometimes, even if getting the outcome in the optimal circumstance is inconsistent.
Bf 109 G-6: I’m extremely surprised the tail came off, extremely. If the outcome was anywhere near mildly consistent that’d be great.
In other words, this is much less likely to happen than the instant kill condition for a cannon/HE 12.7mm, even when factoring in the increase fire rate of .50 cals. This also means .50 cals cannot do structural damage except for extraordinary circumstances.