Wikipedia says that the same member of Duma was suggesting an idea to abolish homework at schools because his son asked for this when he learned that his father was elected. I would not treat him seriously.

"Vladislav Davankov" is a token "liberal". He's supposed to make such statements. Nothing that is uttered by Duma members is worth any consideration -- it's a complete theater.

That's how successful Telegram's PR has been. People believe - like you do - that it's end to end encrypted. It's not.

The secret chats presumably are (if you trust Telegram). Secret chats are 1 to 1. So anything outside of those that most people on Telegram access (massive channels and groups, smaller groups, private groups and channels) is NOT encrypted.

The messages are not end to end encrypted.

There is a feature that can be enabled to create an end-to-end encrypted chat between strictly two users, but most people do not actually use it.

Telegram is largely a social network masquerading as a messaging app. There is a deep network of “channels” that interlink with each other to provide a community for users. None of that is encrypted.

Messages in groups are not E2E encrypted, especially in public groups where anyone can read them even without joining. However, anyone can report the message to moderators. The public groups are often limited (temporarily removed from search, temporarily or permanently banned) if they do too much violations.