If you go all in preflop vs AA you will win 20% of the time so the max you will lose is 80% of the time. Post flop you can have much less equity but you will still probably not lose 95% of the time on average.
Not necessarily 😂 It depends on their hand, position, who is calling, etc. If someone is shoving all-in with random hands they will lose a lot, but not specifically 95% of the time. Sometimes an all-in is correct, and sometimes you have the nuts and just get called by a bigger stack. ♠️