The article talks about Google's SafeSearch. I tried SafeSearch myself to try out how it works. It does filter the search results.
I just used Google's SafeSearch and I turned it to strict filtering.
Here are the topics I got as results for search keyword "sex":
1) Sex Dolls
2) Sexworkers Rights = Human Rights
I also got this image as a search result from Google Images (with strict SafeSearch being used):
