We don't build diesel-electrics like they would be probably most interested in. Something like the Russian Kilo class[1] is more in line with their needs than a Los Angeles attack sub or a boomer.

[1] https://en.wikipedia.org/wiki/Kilo-class_submarine

probably he means not ones USA can export (as in, non nuclear) like this https://en.wikipedia.org/wiki/Barbel-class_submarine

We haven't built a diesel-electric submarine in decades. Our nuclear subs are top notch, but Taiwan does not want to operate nuclear subs, it's too expensive.