I've been bitten far too many times searching the archives for something that ended up not existing or had been read in a book. I do remember this being mentioned, sort of. But I don't ever remember a statement so would be happy to read it if it is provided.
This dog walker has been mentioned a few times in the past, with people even claiming that they made a statement.
I've never seen any proof, and when challenged nobody can provide any.
It appears to be made up nonsense, but I'd be happy to be shown otherwise.