Nobody can know because australian grass was very different from england grass. Wilander and Vilas won majors on australian grass, and never reached SF in Wimbledon. In Australia, they beated very good grass players (and even Wilander heated McEnroe, and Vilas beated Nastase and Borg).
Puppy's work has not been published but he worked several years about that and his study is hundred of pages and has not been refuted by the ATP, who only says like a robot "history is not rewritten" (absurd answer, because it's not the problem). So I think the proof is real.
I think that the main reason is that a big institution always has trouble recognizing possible mistakes ... And maybe they're afraid of other similar complaints (afraid to work ....). But it's ridiculous because Vilas was the only number one not recognized.
They don't have to take weeks away from Connors. It's proved that Vilas was number one a few weeks but the ranking has just not been published. There is nothing to take away from anyone, there is just to give Vilas what it deserves