I watched another video of him last year and it was just..painful. His legs appear to be made of elastic - his movement is ghastly.
If it were me...I wouldn't parade him around. Maybe they're doing everything they can to keep him healthy, but to me, flaunting his size isn't cool. There are enough jackarses out there breeding crap to crap to try and create super giants. People don't need to give them more incentive to do so. It's not "exciting" to have a structural nightmare, especially when they begin to fall apart in front of your eyes and there is nothing you can do to stop it.
FWIW, I had a dane that was 42" at the withers. He was neutered early, but weighed 195 lbs. He was still ribby, but an ideal weight. He was proportionate. This dog's structure might have been exacerbated by an early neuter, but I don't think that's the only thing at play here. JMO.