Fuzhou dialect is the same as that of a place in Henan. Where is it? Who knows?

Not the same language. The old man you mentioned is Fang Binggui, a folklorist in Fuzhou. He went to Henan to find his ancestors, the birthplace of his ancestors! Instead of looking for the same place in Fuzhou dialect, the language families of the two places are different, so how can the languages be the same! Moreover, many surnames in Fuzhou were born in Henan, which means that the ancestors of many people in Fuzhou are from Henan! I followed Min Wang when he entered Fujian!