No kidding! What's the Nihngo racist term
Personally I'd be really interested to see how knowledge of those states could have made their way to O-sensei. (Considering they're mostly lost even from lots of Mahayana traditions... despite the fact that the word "Zen"/Chan refers to jhana.)
Or maybe he had NOT heard of it from any such sources, and just honestly experienced these things. Meaning that if unrelated practices give rise to the same subjective phenomena, then that might mean there is some exciting underlying human physiological basis for these things, and it's not all fantasy!