Granted, it does fly right out of where the cab sits in the frame, but I think that's just pure coincidence.
As I mentioned above, I think that it is just too much coincidence for an 'insect' to appear to come out of the exact point you would expect if there was a problem with the TR. Yes there are some other light 'flutterings' in the video but nothing like that and I also don't think the camera is focused to give the CCTV type insect images we often see . Given the statement from Tony Cable, I'm pretty much convinced that is something from the TR area letting go. As someone else wrote, it's unlikely he would have said that without some inside knowledge so I guess we'll know soon enough.