$200 hotel statement credit combined with waldorf astoria offer

can i combine the $200 hotel statement credit combined with the waldorf astoria offer right now of $180 off $750? the waldorf astoria offer has to be booked directly through their website. does the $200 statement credit only work if booked through amex travel portal?

also if a book a hotel directly with the hotel instead of the amex portal, but the hotel is a part of the hotel collection or the fine hotels and resorts, do I still get the benefits for these like the experience credit, late checkout etc?