Buying Extra MQMs considered as a Platinum Amex Incidental?

Hi All!
I haven't used my $200 airline incidental reimbursements this year and was wondering if buying MQMs would be considered an "extra" or "incidental." No worries if it can't. I wanted to know if anyone was successful on getting some credit with their Platinum Amex after buying MQMS.

Any help is appreciated. I have only 1 more week to spend $200 worth of "incidentals!"

Thanks!