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It is false. Click the link to the FAQ. The paragraph for the quote begins with "To protect the data that is not covered by end-to-end encryption"

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Then it is not correct. A security analysis of Telegram has raised doubts about their e2e before. They have (had?) a blogpost up where they pontificate about how it not necessary and would put a burden on their channel feature anyway.

The security analyses I am aware of target MTProto 1 which is not MTProto 2 used for quite a number of years now. MTProto 2 uses standard security primitives.

You cannot say "it is not correct" without proof. We know all messages not just E2EE are wrapped in encryption on their way out a Telegram client and we know they are decrypted on their way in because client source code is available.

Why don't you have a look for yourself then let us know if you've confirmed your suppositions?

Sure, they're encrypted with a key that they have.

They have complete access to the data.

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