Quoting that definition,

Diversity is variation across a wide range of identities, lived experiences, abilities, and perspectives.

That's the definition. The subsequent list is explicitly labelled "can include, but is not limited to", i.e. it is not exhaustive, and calling out additional factors that are particularly relevant to our context is imho totally reasonable and appropriate here.

I agree with @fantasai here. I would also suggest that in the specific relevant context, the diversity of perspectives based on different industrial/employment/... backgrounds is as important (neither more nor less) as that of other diversity in lived experience.

Note to self: Suggestion: split out inclusion as a separate bullet, ref to CoC, people participating as their full selves; rename the other bullet as diversity of perspective. Neither is a closed-ended list, each will list appropriate things.

Appreciate the discussion here. Suggest an approach that references the usual diversity mention and then an "as well as" for the addition of industry and org size. When this is separated it retains the original lens of diversity while expanding to the addition.

Example:

Diversity: We believe in diversity and inclusion of participants from different geographical locations, cultures, languages, disabilities, gender identities, and more, as well as industries and organizational sizes. In order to ensure W3C serves the needs of the entire Web user base, we also strive to broaden diversity and inclusion for our own participants.