When you upgrade, your new Card will have a promotional annual fee of $0 for one year. In the first billing period on or after the end of the promotional year, you will be charged a prorated amount of the $95 annual fee for your new Card based on the time remaining until your next account anniversary date. On each account anniversary date thereafter, you will be charged the annual fee for your new Card.
however, as you have been previously notified, your Annual Membership Fee will be
$450 as of February 01, 2021.
aggrement的表述确实可以理解为从2月开始年费被set为450了，但是这个和upgrade terms上面的那个升级首年免年费条款并不冲突。年费是450不代表你会被收年费，可能是这个理吧？这个450可以指promotional year之后的执行价格。