I'm not going to tell you they're wrong, per say. You will probably always look more ripped because of the relationship between carbs and water weight. You won't BE more ripped.
Having said that, I just heard one of them say that to see your abs you need to be on 50g carbs a day. I don't know if these guys are good trolls (or you're trolling me or smth) but that's pretty ignorant.
All that matters is low bf% and a good amount of lean mass to cut down to.
Keto is a last resort. I can get ripped as fuck just eating at deficit, getting a good 40/40/20 macro split and lifting hard. Works for the vast majority, too.