That was his opinion. But it certainly looks like a hand print to me from the pictures. I disagree with him for the simple reason that the blood had obviously been staunched by a hand as there are fingermarks on her neck.
I don't think that his description "the palms and fingers were not contaminated with blood", could be referred to simply as an opinion, unless there is photographic evidence indicating otherwise, then I think it would be quite difficult to argue against the description given by Vanezis.
That's an interesting point regarding finger marks to Sheilas throat though, particularly given Vanezis's assertion that Sheilas fingers were not blood stained and that Dr Craig said he certified death without touching her body and no police officer claims to have touched her neck prior to it being photographed.
So if they are indeed finger marks to Sheilas throat, who do they belong to?