[polezo]

Then why does this footnote exist on the google store?

See the last sentence:

¹The Google Assistant on Google Pixel Buds is only available on Android and requires an Assistant-enabled Android device and data connection. Data rates may apply. For available Assistant languages and minimum requirements go to g.co/pixelbuds/help. Requires a Google Account for full access to features. Google Translate on Google Pixel Buds is only available on Pixel.

https://store.google.com/product/google_pixel_buds