That loophole was due to the introduction of the new regs on March 1st 2024. Not applicable now.
Are you sure? I thought the deadline was June 1st previously but was put back to allow clubs more time to get their ducks in a row (which means the Man U Nice situation doesn't set a particularly helpful precedent for Palace)
However, from what I've read, there's not much of chance Forest being barred despite being late with their paperwork.
If it was just last year that the deadline was changed to give clubs 3 more months, it seems a little soft to let them get away with it