Bitcoin Cash isn’t really an altcoin — it’s a fork. What does that mean? The name “Bitcoin” or “Bitcoin Cash” depends purely on which chain has the longer proof-of-work. If Bitcoin miners ever switched to BCH, that chain would instantly become the “real” Bitcoin.
Now you're starting to sound like one of those BCH shills who at one point flooded this forum, but all disappeared without a trace and never appeared again. You can call that altcoin whatever you want, but it's still an altcoin and nothing more.
That was a very horrible dark period ffs, I am glad that it's over. I mean in "theory" he is right that if miners moved there, yeah it would, but users would also have to agree. Just because miners moved, doesn't mean we are going to accept, we can still use this same chain, be a bit more slow and expensive, but we can.
So even when he is right, he is wrong, and he declines to realize what Cash people missed, just because they were miners, and got all miners with them, as long as you do not convince the people, you are going to just stay as a fork, and not be the real deal. Look at segwit for example, we are not using legacy, we did change, we just didn't move to what they want, so it's possible in theory as we saw, just not to that shitty thing.