The lie is that it's not secure by default. Their FAQ clearly says that they have the technical ability to read private messages outside of "secret chats", which is the default option and the majority of messages on the platform.
So all the FAQs on their official site are open about technically being able to read private messages if you don't enable secret chats, and it's somehow lying?
The main page says Telegram is "secure" without elaborating, though. I can see people can be misled, but they're not lied to.
