I think that the author's intent can be meaningful understood without the implication that they don't know about other languages.

I think a reasonable interpretation of the statement is "learn how to use verbs such that you can talk about doing something now, doing something in the future, having done something and continuing to do it, and having some something and since stopped doing it."

In every language humans are capable of expressing those distinct concepts. But boy, that was an awful lot wordier than the way the author put it.