This is old news already; xAI backed out of the deal this morning.
https://bsky.app/profile/kateconger.com/post/3lqbe7bikzs2u
Either way, this "integration" is just Grok being available on Telegram for Premium subscribers only. It's just like any other bot on the app.
Likely because Telegram pointing out that xAI is paying them instead of the other way around is hugely embarrassing.