See, though, those are all weird and in the weeds concepts, though (Ninja is already in the PHB two different ways, Assassin Rogue and Shadow Monk: maybe a "Ninja Clan" Background for a Kara-Tur setting book would be appropriate, however).Since we are on this...and people are talking about things not even touched upon (or touched lightly upon but not really integrated)...
Bushi (fighter with scavenging abilities)
Ninja?? (as in the more traditional type)
Though they have indicated replacements from SCAG in saying certain paths/archtypes could be replaced as the Dragonlance ones...they never specifically spelled these classes out which were also in AD&D
Knight of Solomnia (Knight of the Crown, Sword, Rose)
Wizard of High Sorcery (Moon phase wizards)
2e has more than I can count when you take kits into consideration
3e has a few
This does not touch upon the Prestige classes of which you start getting into the 2e kits again.
So...it may be that his wording was slightly amiss. Probably more of what the main classes they could think of and that had positive response overall have been covered, but not necessarily ALL the main class types that people could name or that they knew about??