What was being discussed was whether BvS doomed JL to not be profitable. Nobody knows that just as much as nobody knows if a Snyder version would have done better. What we do know is they gambled on their reshot version doing better, spending even more money on it, and it still flopped, creating an even bigger loss for the studio, alienating loyal fans, and producing even more embarrassment. All things considered, I think putting Snyder's version out would have worked better, at least somewhat.
I actually agree, at least to an extent. Not because I'm a fan of Snyder's two prior films in the franchise (I'm really not, though I liked certain things about Man of Steel), but because the extensive reworking of the film seems mostly to have increased expense, negative attention, embarrassment, and a general aura of ridiculousness around the whole thing.
I also *really* didn't like the finished Justice League movie. I found it to be considerably worse than Man of Steel, and worse than BvS. The latter I perceive as misguided in a lot of ways, but at least one can see that there was an attempt to do something interesting and impressive.
If the studio and/or DC didn't want Snyder to make his film, then they should simply have put the film on the shelf after BvS. Or, alternately, if they felt that Snyder's film was a disaster, they could have bitten the bullet, so to speak, and delayed the film at that point, allowing more substantial and coherent changes to be made.
I think we ended up with the worst possible outcome, which is a film that nobody really likes and is mostly a joke, tbh. The most memorable thing about it is the mustache fiasco.