Vast oversimplification of the issues involved. Generally speaking entry visits are decided by the MOFA; ordinary people rarely have a say in who comes or can’t come. No doubt they thought he might be an inappropriate visitor.
Of course, his stance may just have been ‘accidental’. He had NOTHING to do with the poster design. You do know that most companies in China have CCCP members on their boards at various levels.
Whatever. It would’ve been nice to have welcomed him, though. Perhaps next time.