He suggested cake, sol and other altcoins.
That gives the idea that he understands cryptocurrencies as he understands those altcoins so he understands what bitcoin is. But yeah, if he don't understand it.
He should stay to what he understand but that's just a recommendation if he wants to listen to suggestions.
You're giving people too much credit mate.

A lot of people don't even understand the surface level concept of cryptocurrencies in general. They're just here because they've heard somewhere that you can make lots of money by "investing".