Hi @N Thanes
Good afternoon and thank you for your question! As I read on the article that you've shared, it only allows polling once a day. The workaround is to have webhooks or else it will be throttled.
On the video, what he might be discussing is about Delta Query.
Delta query enables applications to discover newly created, updated, or deleted entities without performing a full read of the target resource with every request. Microsoft Graph applications can use delta query to efficiently synchronize changes with a local data store.
Delta Query Overview
It is also only supported for the following resource:
And the only related message related to Teams is Channel Messages:
I hope I was able to answer your question. If no, please let me know and I'll get back to you. If yes, please upvote it and accept it as an answer. May you have a great day ahead! 😊