Good points on the Rt declines in FL/TX/GA/AZ. Also, AZ cases are down and FL/TX look to be starting to decline, but GA is still increasing or at best plateauing and 29 states, mostly in the S/W, but not all, are still increasing in cases and most states still have Rt > 1, meaning cases are likely growing.
The "dark matter" theory is interesting, but it does not quite make sense when fairly large populations (like whole sections of NYC/London/Bergamo are showing 40-65% infected, via antibody testing, and with infection fatality ratios in the 0.5-1.0% range, which, in theory, should be significantly reduced if most of those 40-65% infected were not impacted significantly. I don't think there's "proof" either way right now, which is why I think we need to continue trying to greatly reduce transmissions until we have a cure/vaccine.
https://rt.live/