Correct, they're not. PSO appears to be 4 players. PoE appears to be 6. You could call them "MORPGs", but that term has never really been common. They are certainly not massively anything, and I've never seen them described as MMOs at all.
The "traditional" definition involves tons of players (whatever that means for the time period, platform etc) active in the same world/server/instance. Even games with a zillion concurrent players would not fit, as long as those players were "isolated" to smaller servers.