This is a common bitcoin meme now, mostly to try to disassociate bitcoin from the negative associations that the term cryptocurrency has accrued over the last few years. It allows bitcoin fans to say things like "Yes, I agree, cryptocurrency is a scam!" and follow that quickly with "But have you heard about Bitcoin?"

It is, of course, nonsense. BTC effectively defines the term cryptocurrency, there is nothing about BTC which isn't found elsewhere in other cryptocurrencies, many of which are chain or code forks of BTC anyway. It's the biggest name, it was the first mover, but the claims that it is a separate phenomenon all of its own are relatively recent (or have increased markedly in recent months) and are IMHO hilarious.