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Proton launches LLM and crypto wallet
(proton.me)
This is a most excellent place for technology news and articles.
https://github.com/rclone/rclone/blob/master/docs/content/protondrive.md#-icon-fa-fa-folder--proton-drive
There's no api, or there was, when rclone implement it.
According to that page there was an official API library, provided by Proton. They forked it and added features, it didn't need to be reverse engineered.
According you the page, no, you're still wrong.