I dunno man, it could be some convoluted plan but I don't see Johnson and Cummer as that smart. As far as I can tell the story is that they tried to get their man to chair the committee so he could bury the report - but they picked the only man who could manage to lose a one-horse race rigged vote involving a nine man electorate, one of whom was him, and the upshot is that a Tory with at least some sort of principles (and who was immediately kicked out of the party) has assumed the chair.
Now the committee is led by the newly non-Tory it has said it will release the report that Johnson has been sitting on for ages - I think it's exactly what the Tories don't want, although they are desperately trying to get ahead of it by spinning that Russian interference was real but it was somehow against them all the time...
Edit: sorry I misread, we're saying the same thing - apologies.