VW CFO Frank Witter denied any VW involvement during a Bloomberg Market and Finance interview on Sep 5th:
Bloomberg:
"Were you approached during the Tesla go private plan? Were you involved?"
Witter:
"No, I heard about the rumours too. There is no substance from our perspective. That were discussions entirely up to Tesla and we were not part of it"
Relevant segment begins at 1:26 min into this video:
No one that participated in any kind of VERBAL negotiations would EVER confirm with the way everything went down. EVER. They will deny, deny, deny. It is the path of least resistance. That’s how this works and it is one of the things Elon definitely knows about and should have taken into account.