To me, Google's result seems to more precisely answer the question you've asked, as I understand it.

The others mostly give a definition of lesbianism which is fine but may or may not tell you whether it's offensive in context. Whereas the Google top result is to a page about specifically avoiding offensive bias, and and the second is generally about homosexual terminology.

If you wanted the definition of lesbianism, why not search definition of lesbianism?

Also there's nothing offensive about lesbianism so why would you think Google is censoring it? It just means "being a lesbian".