It seems to cover his butt so technically it is not too short.
However, I would much prefer an extra inch longer, this just doesn't look right to me. I think this is considered too short by Styleforum standards.
It can also depend on height too, if this man is short (probably not), this is the best option for him as it makes his legs appear as long as possible, which can make him appear taller.
Thanks lads, I saw a senior partner where this at huge law firm where I visited. He was about 5'11, slim built and I wanted to believe I could pull the same thing off.