I've seen this before. It doesn't work that way, Telegram Desktop first will tell you that "this is an exe file that might be highly dangerous" with a checkbox below to "don't show this again".
Having that said, I think this should still be rejected by the server so it's weird that it worked that way. However, the issue is not as bad as the video claims it to be, a user will be warned.
If you’re using a fully-fledged OS for your secure comms (and using telegram off of a mobile device to start with), this probably isn’t your biggest threat.
Disabling of automatic media parsing as suggested is absolutely a wise choice.
This would be pretty bad indeed if it were wormable.
this does seem to be nonsense, but people do really need to consider Telegram to be highly untrustworthy and not providing any privacy guarantees at all.
for some reason, lots of people consider it to be a similar sort of thing to Signal, but it's not - Signal takes privacy and security extremely seriously, Telegram ... does not.
Having that said, I think this should still be rejected by the server so it's weird that it worked that way. However, the issue is not as bad as the video claims it to be, a user will be warned.