200 kg! that's 440 lbs. He is going to destroy his spinal discs. At his age they are already worn down.
He's 78 and lifting that kind of weight (and has been for years). That's evidence enough his body can handle those kind of stresses. He's stronger than most 40 year olds, and I wouldn't be surprised if his spine was in better shape.
Here is a video of a 75 year old deadlifting 605 with no gear. This video is 100% legitimate, I've trained at that gym for years and seen this guy perform. He's a local legend. Technically, he's lifting off a ~0.5 inch platform, giving him a very slight benefit in the lift. Still, this video is one of the most impressive feats of strength I've seen.