MS don't seem entirely on the same page there. Azure Devops was their first choice for Power BI integration for some reason.
https://ideas.fabric.microsoft.com/ideas/idea/?ideaid=020078...
https://ideas.fabric.microsoft.com/ideas/idea/?ideaid=020078...
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.
And obviously, grain of salt, third-hand knowledge, etc.