hmm...
That's quite an assumption.
Not an assumption. When giving statements they are not supposed to divulge specific facts, so they are vague and general if they say anything at all (depending on how professional they are). So that sort of statement will typically be plural rather than singular, even if it refers to a single individual. The idea is to say something without giving away too much information about what exactly you know, since that may compromise your investigation. The same principle applies to any sort of PR really.
It is the same sort of thing that you would do when making a statement that you have "voluminous evidence" when actually it includes 29000 pages of irrelevant documents, for example.