Yes, briefly. Notified the puzzle author and asked if this was part of the puzzle. Left a link to this SN thread. They replied in #908967 and changed the password.
The current situation is that we have a KeePass database file called whatisthepassphrase.kdbx (see #908590 for how to download it yourself) but don't know the passphrase to open it.
Yeah, I have it as well. I'm watching the lessons 1-2-3 again looking for the passphrase too but I thought there would be a valuable information and clues in the Proton mail from lesson 3 primer.
However, you can log in on https://proton.me/ as thepurplequeen54@proton.me with password froogsliKetoowearpinK##1 (I forgot to capitalize the second K).
But there's no obvious hint, besides the indication that the author expected someone to try this (playing Johnny)