This is O/T but I think that is a little overblown. Not like 2 high safety was invented yesterday. I think it is playing a role as defenses get more analytical in their approach but I'd say the main reason scoring is down is just because QB play is down.
A lot of guys who used to post big #'s have hit a wall this year, others are hurt, others retired....The saints don't have a QB anymore, Watson is suspended, Brady/Rodgers/Wilson/Ryan all seem on fumes and have greatly declined both due to their own performance + team situation deteriorating. Lamar sucked last year. Herbert has had OL/WRs coming and going. Murray didn't have his #1 WR until Thursday.
Is the cover 2 cheat code working vs Allen, Mahomes, Hurts, Burrow? Well, not really. All are playing as well as ever.
Think we're just at a point right now where lot of QB situations aren't great.