This is a matter of semantics... anyone who actually cares about E2EE probably understands the nature of email being cleartext over the wire and that Proton can't control what is outside of their control. Maybe inaccurate but I doubt they are misleading (in the sense that they are hoping to fool people into thinking their email is encrypted over the wire).
Marketing copy would not likely care to include "E2EE" .... "at the point that Protonmail recieves your message" on their frontpage.
I’m gonna start selling sugar-free soda and when people point out that there is sugar in the soda I’ll explain to them that the sugar was added to the mixture by a different supplier before the mixture arrived at my factory.
My factory does not add any sugar to the soda. Therefore it’s clearly fair to market it as sugar-free!
Marketing copy would not likely care to include "E2EE" .... "at the point that Protonmail recieves your message" on their frontpage.
Further, this is explain quite clearly on their FAQ: https://proton.me/support/proton-mail-encryption-explained
</pearlclutching>