I think it's just context. Like stronger than most people ever will be (or even most people in the gym), strong enough for it to be respectable amongst lifts, strong for lifters to think your are particularly good and then freak strong.
I've been in gyms where benching 80kg for reps was really strong. I have a mate who couldn't get some bros to believe he is natural cause he pulls 180 at 70ish. Most people are seriously weak (and unfit, inflexible etc) so I'm not sure if being strong relative to them is worth caring about. I'd go with respectable amongst lifters as more worthwhile, as well as still attainable to pretty much anyone. But I think that needs to be defined relative to body weight so dunno what numbers I'd go with.