Google Ads suspended due to suspicious payment, in 99% of cases, has NOTHING to do with payment, in 99% of cases has NOTHING to do with billing, in 99% of cases has NOTHING to do with card, in 99% of cases has NOTHING to do with VCC, etc, etc and etc.
There are hundreds of reasons why a Google Ads account gets suspended with the reason showing due to suspicious payment.
Based on that screenshot it is impossible to know why that particular Google Ads account got suspended with the reason showing due to suspicious payment.
By the way, appeal each and every suspended Google Ads account, by filling and submitting the Google Ads account suspension appeal form.