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it's not false

In reality almost no one bothers with secret chats (no syncing between devices, no backup and no group chat possible). Instead everything is stored online without E2E encryption, i.e. perfectly readable for the service provider.

> In reality almost no one bothers with secret chats (no syncing between devices, no backup and no group chat possible).

Sorry, but "everything" != "almost everything". So it's false that "Telegram has access to everything you do and say".

Which no body uses and are extremely limited on purpose.

> Which no body uses [...]

False, I use them.

Don't they store the decryption keys?

It's end-to-end, clients store the keys.

Server does not store the keys for secret chats

I see, that's the 1 on 1 chats that are explicitly configured as secret. So by default for 1 on 1 chats and for all group chats the keys are stored on the server.