Under the change of benefits it looks like the Premier is maintaining the Extended Warranty Protection:
You will continue to have Extended Warranty and Damage & Theft Purchase Protection on this account. You can view Your Guide to Protection Benefits on this site under "Quick Links". It contains complete coverage details, including coverage limits, what’s covered and what’s not covered. Coverage details for these remaining benefits are not being changed.
As a cardmember, you will also continue to receive a range of other card benefits including FICO®Credit Score, Citi® Identity Theft Solutions, and Citi Entertainment.
Since OP mentioned taking advantage of Amex offers, I assume that she/he/they have an Amex card and those have not changed in terms of the extended warranty benefit. On my end, even though the benefit with Amex is shorter than Citi, I generally purchase items in which I want extended warranty coverage with one of my Amex cards because of the ease I've always had in the past whenever I had a claim. Thus, I'd rather have only one extra year if it means knowing that Amex will cover me and not make me take the item to 50 repair guys to get a quote, submit a million forms to actually obtain coverage, and then send them the item back (while a bit hyperbolic, I once gave up on a claim with one of my visas b/c of all the stuff they wanted me to do for a not so expensive item < $500 - after that only Amex for EW for me).