But correct me if I'm wrong, this only applies to board rate FD.

For promo rate usually bank will impose a rule where whenever the OPR changes, bank reserves the right to change your promo FD rate despite already locked in.

I see. Thanks for the head up.

Last time I opened CASA account at MBB PJ (which is 25km away from my home) also they're asking me this. They strongly advised me to go back to my hometown branch to open instead of the PJ one. Their reason is because next time if I want to withdraw >25K I can only do it at the branch where I opened my account.
In the end I did successfully open the account, but then they also asked me to write and sign a statement that I'm fully aware and I insist to open at their branch.

I guess your case is because 1 year later when you want to withdraw your FD you need to come back to the same branch, so will be troublesome for you and them.

Affin 4.5% promo, reported by relatives, confirm Jalan Genting Klang branch still have as of 13th July. According to the staff there, still open until quota hit or end of August.