I am not dismissing it out of hand, and I would be happy to have it proven true. I have read the entire post (and I have read it in the past). I am not even saying it is wrong - it is just one of several possibilities.
It doesn't answer the question, why do we think William Backus, master cutler in Sheffield was the son of William Backhouse of Great Hammerton? My understanding is there are no baptism records, no wills, no apprentice records, no court cases, no family associations, etc. to suggest this. It is a simple name-is-the-same argument, which is not good enough to establish the English origins of a Great Migration immigrant.
Again, we would be happy to evaluate any actual evidence that ties the immigrant to William Backhouse of Great Hammerton. Is there any?