Doesn't Capcom still own that IP, maybe they'll sell or loan it but it seems very weird. Also outside of Rising, Bayonetta was their biggest IP so outside of rising itself I'm not sure that quote will be accurate anyway.
Kinda want it to be Vanquish would suit Microsoft's demographic more last I saw it sold around 800k which was ages ago so it's wasn't exactly a large bomb.
I don't think Capcom wants to do anything with the Okami IP, and apart from Rising I don't see the internet getting up in arms because of Vanquish. If it is indeed true, it is probably working the same way Bayonetta 2: Microsoft shows interest in the IP, get license to publish it from Capcom and hires Platinum to do the job.
Unless it is an IP that has no relation to Platinum so far.