I didn’t ask for a “logical conclusion” from some vague data they gave, I asked for a clear official source.
MMR does try chase your SR, but there can be slight differences (even more so if you look at past decayed accounts). We have no info on how big those differences can get with normal play, so we can’t conclude anything.
The link you posted isn’t a proof, nor it is an official Blizzard source (with all due respect, it’s just a forum moderator, who does not work directly for Blizzard AFAIK).
Edit: And now that we have an actual official answer:
You can see that the MMR carries on.