First it was squirrels, windfarms, then cats(!), now ravens. The RSPB seems to be on a mission to prove that all the usual suspects have no impact on birds whatsoever.
It can only be a matter of time before we see the society issuing a press release headed: "New research shows gamekeepers no threat to birds".
Meanwhile the GWCT have proper scientific research (c.f. guesstimates and waffle) to prove that sparrowhawks kill up to 40% of grey partridges (a threatened BAP species) overwinter. Expect an RSPB denial imminently.