I'm not messaging to you but to HN via E2E https connection.
You can't read that messages as they are transported, you can read them afterwards because HN makes them public not because my message wasn't send encrypted.
You seem to be mistaken about what the "ends" refer to in end to end encryption. If I whisper something in my friend's ear and she whispers it into your ear, that is not a secret message between you and me even if each "hop" was private.
E2E means no intermediaries see the plaintext, only the original sender and ultimate recipient see the plaintext. HN is not the recipient of your message, it's an intermediary.
Telegram is just the middleman between sender and receiver.
When you write on HN, the receiver is HN. That message is transported via E2E https encryption so it's secure.
But because HN displays all messages publicly you can read them after they were received.
This doesn't change the fact that the transport as such is E2E.
That your message is transferred from your computer to the recipient, HN's servers, encrypted. At no point should anyone in the middle be able to read your message. After arrival, HN then publishes it on a public forum for everyone to see.
The people signing up for telegram in droves aren't looking for a replacement for signal or wickr or whatever "secure" messaging platform.
They're joining their friends' group chats and subscribing to their friends' channels. It's a replacement for twitter/facebook more than anything else.