The disagreement explains Boot Camp. Not the other way round.
If Boot Camp had been sure to be released, Apple wouldn't have cared if Microsoft would release VPC Intel or not, so there would have been no disagreement.
Therefore, if there has been a disagreement, Boot Camp must be a reaction to the disagreement.
For that reason, considering the time it's going to take Adobe to release Photoshop for Intel, and considering that there's a good chance that Boot Camp is indeed...