Qatar likes to be 'friends with everyone', so it wouldn't surprise me at all if this is true.

As the report says, Qatar has done things in the past that annoy the Americans (Al Jazeera, hosting Iranian president) so this isn't so far fetched. They may not be donating money specifically for buying weapons, but they'd be pretty naive not to think that at least some of it isn't being used for that purpose.

And I've heard several people state that one day Qatar's attempts to be everyones friend will backfire on them.