If you haven't considered it, you can also use the direct wikitext markup, from which the HTML is derived.

Depending on how you use it, the wikitext may or may not be more ingestible if you're passing it through to an LLM anyway. You may also be able to pare it down a bit by heading/section so that you can reduce it do only sections that are likely to be relevant (eg. "Life and career") type sections.

You can also download full dumps [0] from Wikipedia and query them via SQL to make your life easier if you're processing them.

[0] https://en.wikipedia.org/wiki/Wikipedia:Database_download#Wh...?