BCH was invented way later than satoshi did disappear so I guess there is no proof on wether he likes BCH or not the only thing we can do is assume. On one point if he wanted the blocksize to be 8mb why didnt he do it himself? On the other side 2009 space for data was more valuable and today you can get a lot more storage for the same money so it would be logical to aim for a bigger blocksize so we wont have a month of backlogs... if by some mystery all of the bch from the accounts we think that belong to satoshi send their bch to a burn adress this obviously would prove that he is against it, but however I dont think this will be possible as nobody heard anything from satoshi for almost a decade...