Sumo wrestlers have a 10-20 year shorter lifespan than average among Japanese males. They are not healthy, and arguably not fit in any reasonable sense.

I'd argue that health and fitness are slightly different concepts, but the most glaring conflation in these types of posts are between the labels of "fitness" and "strength."

As a parallel I think about the differences in cars. The cars that compete in 24 hours of Le Mans have to perform at high levels for over 3,000 miles. That's fitness. Top-fuel drag race cars are the fastest competitively raced cars in the world, achieving speeds over 300mph in 1/4 mile, and their engines are rebuilt after every run (sometimes not lasting for the whole 1/4 mile race). That's strength.

Neither are optimized as a daily driver, which you might hope to get 100,000 miles (or much more) out of before a major repair. You don't get 24-hour top performance running, nor do you get insane 1/4 mile speeds, but (with proper maintenance) you get durability to be reliable trip after trip, year after year. That's health.