As ever, I would say 'not so' with regards to Lee Shing.
Yes, commercially Lee Shing promoted Ip Man and his HK teachings, but we all know that he taught a wider curricullum to all his students from Austin Goh to Joe Lee to Joseph Cheng and my Sifu Joe Man.
Other than think he 'added' to what Ip Man taught him, I was always of the understanding that this was simply Wing Chun. Whether the 'other stuffs' are from Fatshan, Kulo or Hoxan (Lee Shings birthplace) doesn't really matter to me personally.
What I do know is that Ip Man knew what Lee Shing was doing! And this was one of the reasons Lee Shing took him as his Sifu and Ip Man took him as his student. Of course, he also trained with and was introduced to Ip Man by Lok Yiu and Jiu Wan, so the Fatshan flavour was already there.
Just passing on what I know.