As per the article

The issue is that for European e-bikes, 250W is the legal limit for both on-road and trail usage. So if you’ve got a 250W e-bike, you’ve basically tied every single other e-bike on the market for highest power. Of course, none of the 250W e-bikes rolling around today actually put out only 250W of power. They all sneak by with higher peak power ratings, but the continuous power ratings are all identical. Thus, claiming to have the world’s most powerful trail-legal electric mountain bike is a bit like claiming to sell the world’s tallest 6-foot ladder.