Telegram deleting messages appear to work for me. Likely this guy is just buying into Signal FUD that Telegram is somehow worse encryption, despite Signal's encryption being used by Facebook and funded by the US Govt.

The claim isn't that Telegram's encryption is worse, it's that Telegram's closed-source backend is unauditable.

Your other points are a great example of FUD.

edit: changed clients to backend

For all practical purposes, Signal's backend is also closed source. The public repository for the server code hasn't been updated since April 2020 (nearing a year now) though Signal has, in the meantime, come up with features like new groups that necessitate storing more metadata on its servers.

I think Telegram clients are open source, aren't they?

You're right, edited. Thanks!

What does using the same encryption algorithms of a government or business have to do with the conversation? Are you implying that the algorithm is unknowingly back-doored, with the evidence being that Facebook uses the same algorithm? Or am I misunderstanding your point?

I honestly didn't know Telegram had that feature, even though I've been using it for nearly a year.

Stand corrected now, thanks.