Bigger numbers always sound more impressive. Many hair dryers also have a power rating of 1200W. Also some policy package costing 700 million somehow sounds more than 1.1 trillion.

in this case, it's probably a deliberate choice, because chargers in the wild are generally commonly rated anywhere from 11-350 kW, keeping it in kW gives drivers who are used to seeing '## kW' an easier time comparing without having to do mental math.

Well I just walked 12 billion nanometres to the toilet.