I agree that ProtonMail and GMail are not the same in terms of privacy protections. But, the article implies that the bulk of advice provided in the article is somehow a guarantee to anonymity. A reader may easily assume that ProtonMail doesn't log any IP addresses at all based on that misconception. ProtonMail even used to claim exactly that in their sales page until that incident I linked to.

In fact, the article is the anti-thesis of itself. Blanket anonymity advice is the worst anonymity advice.