In the end, of course, the answer to the question he poses doesn't really matter.
Given how many amp makes that have been on the market for a long time, it's impossible to categorize this stuff accurately, so why bother?
We know an old Fender doesn't sound like an old Gibson amp, nor does it sound like an Ampeg. A Marshall doesn't sound like a Vox. These are but a few examples. In fact, the only connection these amps have to one another in terms of tone is the "country of origin" where they were originally conceived. So we stick them into these artificially contrived boxes.
Incidentally, he couldn't come up with a Japanese sound, but how about the Roland Jazz Chorus? Very unique, until you turn the chorus off, and then it sounds not unlike like any other solid state amp, right? But you have to give Roland some credit anyway.
I guess it makes for interesting conversation when one has nothing else to do.