>> 原材料名: 本わさび、西洋わさび、...

...except the everyday stuff shown in your link indeed contains substantial 本わさび as a first ingredient, whereas the typical stuff sold in the US[1] is effectively just 西洋わさび and happens to be explicitly labeled "For external Japan" (despite also being manufactured in Japan) for reasons.

In other words, a consumer in Japan who settles on "close enough" isn't really making an equivalent compromise as a consumer in the US.

[1] https://www.sbfoods-worldwide.com/products/search/001.html