I do not believe that this is what he is trying to say.
He does not mean "use plaintext" when he says "don't salt hashes." He means "use a key derivation function."
> if you can't use bcrypt or something like it, you should store passwords in plain text
No, he's saying that if you can't use an acceptable hashing function, you shouldn't store passwords at all.
But, why would you be unable to use at least one of the suggested hashing functions, anyway? It's hard for me to imagine a language or platform where none of those functions is available, excluding very simple, special-purpose systems like PLCs.