No, this is wrong. Outclassed mons should only be ranked if they have something over their opposition. Florgres has literally nothing useful over Sylveon. they have almost identical movepools, but sylveons is better offensively and it takes hits overall better. Florgres only should be considered over sylveon in doubles where its ability gets use, but even so Sylveon should still do better than it. We do not want to give people the idea that certain pokemon are OK to use when Florgres is NOT ok to use as it is outclassed in every single possible way by a single pokemon alone and it gets nothing over that pokemon.
Thats not what he said with what you quoted.
He said that outclassed does not equal not viable.
Not Viable is Articuno is OU. It has absolutely no business being used in OU because of its outright terrible typing, etc.
Outclassed is Florges.
Example: If Gamefreak chose to release another Water/Electric pokemon with Levitate tomorrow and it could do everything Rotom-W could do but better does that mean Rotom-W becomes no longer viable in OU? Considering how its performing now I believe we can safely say no.