More information will come up in the release which we remove it but we constantly evaluate features in the software which are seldomly used yet cause us overhead a lot of evaluating/developing/supporting them. This is not to say this will change in the future or that a third party can't add this payment method in for you. Regardless though, at the moment, it sounds like these are getting deprecated so will not be available from Stripe themselves.
Apologize that you found this not helpful. Sometimes without more information about the API usage involved, we're a little blind on why something may be getting reported that it is in use. In this case we could have reviewed your instance more or Stripe could have reported that you were using the API as outlined (they have this information as they're telling you you're using an outdated API 🙂 ). However, it is good to see that we got the answers we needed and apologize for any inconvenience here.