Author here, I wrote at the begining of the text that it isn't fully supported yet :)
"WebGPU was first published in mid-2021 (super new!), so it isn’t fully supported on browsers (also shows how you can enable it) yet".
My main goal is to bring this new technology into attention, I don't intend nor do I have any incentive to recommend people using it in production. Sorry if that wasn't completely clear.