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ProtonMail provides information used to identify email owner...
(www.404media.co)
Privacy has become a very important issue in modern society, with companies and governments constantly abusing their power, more and more people are waking up to the importance of digital privacy.
In this community everyone is welcome to post links and discuss topics related to privacy.
much thanks to @gary_host_laptop for the logo design :)
Yes, that's basically what I was getting at. So it sounds like as long as Google knows the account emails are being forwarded to (can see the headers) there is no notion of privacy.
The way email forwarding works is: email is being received in full (by Google in your case), they look up processing rules, and send a copy to your Proton account, then optionally delete it.
The only thing you protect yourself from this way is Google knowing your IP address every time you check email. They have seen the contents and all headers of forwarded messages.