This is his official Twitter account, so unless we have been taken in by an imposter for over a year I'd say it's him.
As for whether his comments will influence or not, I am not so sure. Perhaps not in a case like this which appears to be reasonably clear cut, but in close cases (ie Ma'a Nonu's shoulder charge) I can see a comment from a CEO as perhaps tipping the decision whether to cite or not. I can certainly recall Greg Peters (CEO of SANZAR) being interviewed about cases in the judiciary (comparing the SANZAR and the NH one) and he flatly refused to comment because it was inappropriate.
I do know that every player appearing before the judiciary should have the absolute right to a fair hearing, and it is good practice to let the judiciary just get on with it. This is the way it is done in all matters criminal - a PM or a Justice Minister commenting on a case that is before the courts would probably have to resign. The IRB isn't a country, but there should still rightly be appropriate separation between politicians and the judiciary.