It is
very specialised, I think he's said (on the TT Forum) his normal chainring on his commuting bike is a 56 or something. He's built up to that size over a period of time and the 'rings are custom made carbon ones, I think he said he gears down, or has in the past, for a 12 hr and
only uses a 74 or 76.
His tri-bars are heavily modified/homemade ones to get him in exactly the position he wants and he made his own behind the saddle bottle holders for long events so it was what he wanted and not just the best thing he could find to buy.
With the short cranks, well apart from the "walking stride", they are also stiffer and more aerodynamic as they keep the amount of space that contains spinning feet and legs about in the air smaller so punches a smaller hole in the air.
He's explained or answered some questions in the past about it on the TT Forum so I'll see if I can dig up any old answers or comments he's posted about the gears and his philosophy behind using them.
I do remember seeing something he'd written in reply to someone asking a question about cadence and the best tactics for riding up drags/in to wind.
"If your lungs hurts change up a gear, if your legs hurt change down a gear, repeat until everything hurts the same amount".