The Japanese navy had NO MORE COMBAT experience than the United States Navy in May 1941.
I think he's referring to training rather than experience. if "we fought wars continually since" is the measure of experience then it's UK #1, US #2 and everybody else a distant third, since you can trace that heritage back to the days of sail.
But it is equally incorrect to suggest as he has implied that all US ships had untrained, inadequately trained, or even "not extensively trained" crews. It depends on the ship. The USN doubled in size from 1940-1942. Ironically, any US ship that the Axis met in 1939 was likely to be crewed with people who were extensively and intensively trained.
For ex the most intensively trained night fighting ship in the world in 1941 may have been USS Augusta. Anyone who can recall *why* gets an "A for the day." Anyone who replies with "Omigod omigod like totally how can you SAY that mygod the Japanese were best everyone knows that under the rock from which I crawled" should crack a book now and then.
The IJN pilots would have more experience though, correct? Didn't the IJN operate in China quite a bit?
Mostly not and mostly the wrong kind of experience. Different opponent different aircraft different fighting doctrines etc.
