It's not that simple, what they have copied could not have been created purely from looking at another teams cars (as Aston Martin claim), especially as one part has only been on the Red Bull for about a month. They believe that mechanics that Aston Martin signed from them have handed over critical information from Red Bulls IP... which is illegal and beyond 'copying another teams idea'.
Could just be BS but not sure why they would be this annoyed unless they genuinely feel something dodgy has happened, its not like Aston Martin are a threat to them.