IMO the concerning part is hidden at the bottom. They want to go back to shoveling politics in front of users. They say it is based on viewing habits, but just because I stop my car to watch a train wreck doesn't mean I want to see more train wrecks. I just can't look away. FB makes theirnacrions sound noble or correct, but this is self serving engagement optimization.
Social media sites should give users an explicit lever to see political content or not. Maybe I'll turn it on for election season and off the rest of the year. Some political junkies will always have it set to "maximum". IMO that is better FB always making that decision for me.