> FYI, this is a totally misleading and false claim.

No, you seem to have have in fact fallen for Telegram's continuous intentional misinformation.

The only thing that matters for whether we can call something "encrypted" or "plaintext" (or more precisely, "end-to-end encrypted" vs. "storage encrypted at rest" or "encrypted in transit" etc.) is whether they, the service providers, can access it themselves.

Would you argue they can't? And if so, how come can I log in to my Telegram account using only SMS verification and access my old messages?