It's not nonsense. That's what they said.This is nonsense. The only thing WotC is committed to is maximising profit. The shareholders see to that.
Personally, I think 5e already has too many classes. If it were up to me I would be axing monks and sorcerers, not adding more. "More classes" goes with a "highly specialised classes" paradigm. Since 5e moved away from that, it doesn't need so many.
WOTC is not committed to maximizing profit.
WOTC is not committed to maximizing the profit they can make out of the minimum effort.
That's why half their books are full of waste.