There's no definitive evidence readily available to confirm whether Hans Wolff, specifically, ever visited Dorset. Primary sources such as diaries, letters, travel logs, or biographies would be needed to ascertain this information, which is hard to access through standard search engines.

Hans Wolff was a 20th-century musicologist; he wrote about various periods and locations, but without more information about the context in which Wolff claimed to know Dorset, it's challenging to deduce the reason.

Here are some possible reasons why he might have said he knew Dorset:

• Academic Research: If Wolff was studying English music history, literature, or folklore, he might have become familiar with Dorset through research, even without visiting.
• Second-hand accounts: Knowing the people who have lived in Dorset or knowing the history of the county from a distance.