Which only came into effect on March 1 2024, so people still have sub 1400 FIDE rankings from 2024.

They don't - ratings of everyone under 2000 got increased, according to formula: player rating + 0.4 * (2000 - player rating).

So everyone now has rating above 1400, except if their rating fell under in meantime, in which case they will be removed from next rating list.