That’s not quite accurate.
There will be an increase in how long it takes to get funds paid into the bank account. It looks like Amazon is equating deposit-taking bank with non-participating PSP.
[Moderator edit: SEAmod lined out the sentence above.] To clarify, there are Participating PSPs, there are Non-Participating PSPs, and there are the Amazon direct disbursements made to the deposit account you have on file with us. It is only sellers who continue using a bank account from a non-participating PSP after May 31, 2021 who will be subject to a longer disbursement reserve period of up to 21 days after the latest estimated delivery date.
If you’re using a bank account from a participating PSP, then this doesn’t impact you.