PATCH NOTE HIDDEN CHANGE "RANKED DEMOTION"
mmr now reflect your actual mmr you can drop tier diamond>plat>gold>silver>bronze
back to season I
mmr now reflect your actual mmr you can drop tier diamond>plat>gold>silver>bronze
back to season I
Can anyone else back this up?
They did that some time ago. If your mmr goes to total trash (I mean really really below your division) then you can get demoted.
This is why so many people went way down in rank upon the new season and placements. Their MMR was way below where they were.