Had hoped a certain PPRuNer might reply as I thought it was him working GMC and sure he would remember...
Don't think there was a security risk of any description and GMC were obviously aware of the problem and I presume were watching for any traffic conflicts - hence him being pulled up on the errors. It certainly didn't seem to be deliberate disregard to instructions.
And no I don't work for the company involved - nor do I know which company it was!
It sounded, on the air, more like a case of being unable to cope with the 'multi-tasking' of copying clearance - presumably without pen and paper and actually relating it to what was then required.