this is an unusual high offer for the personal version of AMEX platinum, you may see high offers from the Biz platinum up to 250k signup bonus, but the personal verson usually only 80-120k.
use firefox and open in private mode, keep trying to you see a high offer, it may range from 80-175k.
https://www.americanexpress.com/us/credit-cards/card/platinum/
goog luck.
