I just phone up the Service hotline of UOB and noticed that the 4 Seasons Hotel promo is gone and it is actually a promo from VISA Infinite itself and nothing to do with UOB Bank.
Actually it work out great if you pay for the HK$6380 annual fee and get 60,000AM back! Obviously if you want to top up your AM account for a business or first class redemption from CX. Much netter than buying the AM from CX.