In the post it says:

24 hour grace period on deposit fees - this means that you will be able to withdraw LP tokens from 1 Farm or Den and move it to any other Farm or Den with no deposit fees.

So I was wondering if it somehow only applies to funds withdrawn from a farm or den and new funds being added still have a deposit fee, but I don't see how that could possibly work so I'm guessing it's just that all deposits have 0 fees for that 24 hours period. If that's the case then I will definitely be taking advantage of that opportunity to deposit some more funds!