Possible, but I have a lack of complete confidence in that explanation. It's an easy excuse to cover up a lack of ability to catch a disturbed individual if that is the case. Or it could be foxes. From my reading of press reports, and this is only a hazy memory, wasn't there some ritualistic placing of body parts? That could be yellow press as well. The press here, generally, seems somewhat unreliable.
If so, if it's not foxes one would hope that the perp does not move onto humans next. We'll find out in time, I guess, if that's the case.
In any event, I would suggest keeping one's cats indoors. That way they neither are at risk nor do they poop in neighbor's flowerbeds or kill songbirds.