I'm pretty sure that's a kind of misunderstanding
"When each maximum is reached, the website will be updated immediately and no further applications will be accepted in that category."
this sentence proves the obvious fact that application intake is closed after accepting of the certain number of applicatons.
Nothing more. No one word states that "the quota will be increased every 3 months". I.e. - on the 1 of April the table really will be "updated", but if the quota should have remain the same at that moment - the table will be "updated" with "old" values.
I'm not claiming that "the intake opening on 1 of April not gonna happen" - I'm saying only, that there's no direct, neither indirect promise of "increasing of the quotas (and opening of apps intake) on a quarterly basis".