So why do we have to assume that this time they did fulfill their part of the treaty?
It is also made clear in "good war" that the Horde no longer uses the "Zoram'gar" (Page 59) outpost, which is the one that leads to Ashenvale. That at least is an indication that they are not in Ashenvale. Now we have none.
You are right, it is not the same. but it doesn't mean that they may not face consequences for Ashenvale in the same way that they did not face consequences for Teldrazzil.
I mean remember that we talked about Blizzard. That she officially said that Tyrande was too busy getting revenge to do something in the second half of BFA and that she had gotten revenge on her...and she hadn't even attacked the lumber mill by the looks of it.