ACH you cannot delete the payment method unless you add in a new payment method. We want the functionality to align with the current Credit Card payment method.
With a credit card, you can delete it as a single payment method as long as there is no active subscription.

Below is a similar post: This is similar, however, not our experience, we are able to delete a single saved credit card payment method.

“As an admin, I would like to be able to delete saved credit cards from accounts at any time, even if they are the only card saved and even if the card is linked to an active subscription.”