I'm guessing the incompatibility is umbilicals and pressure, maybe in hindsight that should have been standardised on commercial crew. But they hype it up then get to the point in the final paragraph: a Crew-9 return, aka the plan, is a non-issue. The no suits thing would apply only until Crew-9 launches next month, and in the unlikely event they need an emergency departure before then (though leave it to Starliner to have the first evacuation ever in 20+ years of ISS happen now), I'd think they have bigger fish to fry than spacesuits, that is, no free seats on anything docked. What, are they gonna strap them down on Dragon's cargo racks?