Questions about UNO Bank's 6.5% Time Deposits. What's the point of locking to a 12+ month Time Deposit when the 3 month Time Deposit also have a 6.5% rate?

Hi! I'm thinking about putting my savings in Uno Bank via GCash. I noticed that the rate for Time Deposits are basically the same for all durations.
https://i.imgur.com/MmX7lSk.png
Correct me if I'm wrong, does this mean that if I put my money in a 12-month Time Deposit, does that mean that the 6.5% rate is guaranteed for that duration?
If they suddenly lowered their rate in the middle of my Time Deposit, that Time Deposit is unaffected but any new Time Deposits will have the newer rate? Am I assuming right? Sorry, I'm very new to this. Hoping for your guidance. Thank you!