I wasn't even aware of those alleged falsehoods coming from Tutanota...
IMAP server that returns the PGP emails and requires your mail client to handle the decryption? Yes.
Essentially my point.
. However, that goes against a major selling point of the product which is that it manages all that encryption for you (like a password manager). Nobody in their right mind would use that.
Why not, if they actually do everything with open standards and by the book, why can't they provide IMAP/SMTP access to everyone who wants BUT add the disclaimer that you've to use a PGP compatible e-mail client and configure it to deal with the encryption... but they don't and that is a red flag. Most of their users are tech savvy people wouldn't oppose setting that up.