Taf should not be directing his blame at the Reds. We've seen all these tactics for covering up a piss weak scrum before as the Wallabies were the masters of smoke and mirrors scrummaging for years (how we exasperated the English with that!).
It is for the Reds to get away with whatever they can and for the referee to adjudicate correctly.
Carter probably did ground the ball, but until there is some kind of GPS/tracking system in the ball it has to be seen to be awareded (the ref being well positioned tends to help with this, but in this case maybe not). The real travesty was the scrum being awarded to the Reds - again, not the Reds' fault, it is for the referee to adjudicate correctly.
It will always sound like sour grapes when anyone complains after the event....but if things weren't kosher people do tend to complain.