I can confirm this. I have just deleted my all-time most popular answer ever, and turned it into an answer wiki instead for What is the difference between realize and realise? Can it be used interchangeably?
The 20k views of that question are gone from both my stats graphs, and from my profile “About” sidebar. It took maybe an hour for the latter to refresh; the graphs lost the deleted answer immediately.
I can’t confirm the same for upvotes, because said answer never got any upvotes. As befits something that should have been an answer wiki to begin with. (It was just a link of related questions. And I hadn’t made it an answer wiki at the time, because No Onboarding On Quora.)