>from 11 sources spanning seven languages, English, Chinese, Russian, Vietnamese, Spanish, Turkish, Indonesian, German, and Indian-English
So hardly "all of human cooking"...
Yes. I mean if you look at the corpus basically HALF of recipes are Chinese/Korean.
They do quickly acknowledge it, but definitely not a balanced set.
That does represent 70% or so of the current world population. It isn't 100% coverage but it is most of the many of the biggest groups.
It is missing the Italian, Japanese, Greek and Mexican cooking - that are incredibly popular worldwide and it is incomplete without them, and nothing from Africa at all or Middle East.