Does the $200 Hotel credit apply towards buying points from Hilton/Marriot/etc?

I got an email from Hilton they are matching points I buy, ex. spend $200 get 20k points, and they add 20k bonus.

I'm wondering if I use my Amex to buy the points, will Amex credit me $200 since it will probably show Hilton on the charge or does it only work for bookings/stays? Thanks