He mentioned old scars and the wound with the paster Maggie - there is no reason for him not to mention such cuts and every reason why he would as they would perhaps add support to her using the rifle.
Nobody can say he didn't mention wounds, unless they can produce the original pm report from the period when police were dealing with coroner's inquest. Scribbled notes referring to a lack of contaminates are not necessarily in the context of wounds. Perhaps the plaster was a contaminate and this is why he mentions it?
He had every reason to omit the wounds to Sheila and June under Ainsley. Ainsley cannot succeed if Vanezis doesn't omit the wounds. I suspect Stan Jones persuaded Vanezis that no phone call took place between Nevill and Jeremy and that he (Vanezis) needed to assist police to catch the devious Bamber.