Before the season started, I added 10 IR spots in Yahoo for Covid only IR. But as of now the NFL (or the teams) hasn't added the Titans and Steelers players to the Covid 19 IR list. So it seems a positive Covid test is required to land on this list.
For this PIT @ TEN game postponement, the swapping around of bye weeks will mean no games lost, but that won't work if multiple games postponed and especially after teams have had their bye weeks.
I have toyed with the idea of adding 4 BN spots for these situations only, but that would require lots of policing and would totally mess up how waivers are executed. I'm leaning toward the 'tough titties' approach, as Yahoo doesn't allow commish to override a players status to put them in IR, they must have IR, PUP, or O (out) designations to be in IR spots in Yahoo.