Proton mail is owned by the World Economic forum.:
https://www.weforum.org/organizations/proton/
You are further empowering humanity’s greatest enemy when you use it.
When you send a ProtonMail, you are sending Communism!
Looks to me like that page is meant for their members. Looks like it is promoting Proton as truly secure service for their criminal members.
So open a library book & start studying encryption & how to do it long hand!Yes its more work but is more secure.