Correct, I've only heard this from two people and this is only their take. This is not an official position.
But the fact that people within the company are saying this to me directly is enough to get me to believe it.
I wouldn't trust a random person on the internet saying stuff like this either, but even without any inside knowledge, it's just logical that they should try and limit time spent developing two of the exact same product .. and I think it's probably becoming apparent to you as well which one is on the chopping block.
From what I understand the goal at the moment is to get GitHub closer to feature parity with ADO before they start to deprecate it .. so hopefully it's coming.
And obviously, grain of salt, third-hand knowledge, etc.
My thinking is that you should extract as much logic as possible into some neutral format that you can run on any CI platform. Bash, Docker + Makefile, Earthly, python scripts... whatever keeps as much logic out of a proprietary vendor specific format.
Some of the Microsoft teams don't listen to user feedback.
We use Azure DevOps, feedback from years ago for basic features still not developed.
https://developercommunity.visualstudio.com/AzureDevOps