Calling Bitcoin Cash "the true bitcoin" (or whatever) doesn't help anyone.

It doesn't make BCH get adopted more, and it just confuses new users.

When someone hears about Bitcoin, and they decide that they want to buy Bitcoin, they want to buy the Bitcoin they've heard their friends talk about, or that they've seen on the news, or (god forbid) saw Elon Musk talking about. Whether or not they're misguided is besides the point, they want the Bitcoin that pretty much everyone they talk to calls Bitcoin.

Words and their definitions change. The definition of a word isn't based on what the first person who ever used the word thought it meant, it's based on what the general public believe it to mean, and they have decided that Bitcoin Core is Bitcoin. Now by calling Bitcoin Cash, Bitcoin, you just confuse new users, and worse yet, if they buy BCH thinking it's the Bitcoin they've seen in the news, then find out it's something different, they'll probably be very resentful towards Bitcoin Cash and it's community.

Instead of trying to convince new users that Bitcoin Cash is "the true" Bitcoin (which just confuses them), maybe try to explain to them the merits of Bitcoin Cash, and why Bitcoin Core has failed as peer to peer electronic cash.

So, definitions change, the general public view Bitcoin Core as Bitcoin, calling Bitcoin Cash Bitcoin confuses new users, and probably hurts adoption more than it helps.