This shows no such thing.
It shows what it shows.
What the explanation is, that actually requires research. Anything from new food additives, changed lifestyle habits forced by the pandemic, increased chronic stress, screen addiction compromising other opportunities to be active, less walkable neighborhoods, more elevators, higher calorie diet, cost increase in healthy diet to just name a fraction of possible factors.
Or, more simply, many eat like there is no tomorrow because food is easily available, cheap, and the calories very palatable.
See https://news.ycombinator.com/item?id=27936016 comments, although the main link appears dead.