Which… I think was a single buff made for DF in a patch maybe a year and a half ago?
Edit: I’m also not sure if it was a meet half way revert like Lucio got though. So I don’t know if DF went from 25 -> 35 (that just seems way too high of a jump though).
They revert some number changes, yes.
Like Soldier bullets back to 20 dmg, Doom shieldgain or Mercy Valk healing.
What Blizzard won’t revert are big things like Storm Arrow back to Scatter or Mercy back to Massrez.
Like others have already mentioned, Blizz only does small reverts that usually have no significant impact on the gameplay whatsoever.
But when it comes to huge changes and reworks, they will always say that no major adjustments were ever wrong. Every hero rework so far has been a “major success” for them. So in that department you’ll get no reverts.