I can believe there are at least a few "rogue" NFL Owners out there who would just as soon tank but being stupid enough to start an actual conspiracy by involving/paying the coaching staff seems unlikely but not implausible. Some people think they can get away with anything, being either mega wealthy, powerful or just psychotic. Problem is that you'd have to be really certain the people you involve are more than solid, or something like "this" happens.
Race issues aside for a moment, Flores is either just lashing out or he's sort of José Canseco who came out with wild allegations about steroid use in MLB. The sports media initially panned Canseco (bc he wasn't exactly a pillar of the community), until they couldn't anymore as more evidence leaked out regarding widespread steroid use.
The BB text messages don't tell me anything other than BB was probably having a senior moment texting the wrong person. And Owners sacking coaches over not getting along, isn't a new (or obviously racial) thing.
I hope flor Flores sake he can prove it, or he'll have set back his purported racism in hiring concern immeasurably. (Which I believe is real, but not overt racist behavior, in general).