Thanks for getting back on this! Source on this - I’m an engineer on the Patreon team. Our public documentation and client creation flow have callouts about v1 deprecation. V2 has been the main API for about 5+ years, discourse is one of the last integrations that still isn’t using it.
EDIT: Feel free to DM or email (in case I don’t get notifications from discourse) if y’all need additional information.