The parent post said no E2EE for group chat. Telegram doesn't seem to support that according to the linked page. Telegram group video chat only allows up to 30 people for the time being, which is far too limited. Also, group chat is not the same as "conferencing platform".

If an app which supports groups video calls counts as a "video conferencing platform" in your book, then you're better off using either Facetime or Signal, both of which support E2EE, unlike Telegram.