The ad doesnt sound like they are highly thought of but you can actually get toxoplasmosis from stroking a cat if they happened to have microscopic traces of faeces on their fur etc.
Having said that ive been around unwormed farm cats all my childhood, worked with vets since the age of 15 and wouldnt say i'm any more particular about cleanliness that the next clean person so when i demanded a toxo test when i was pregnant i was astounded by a negative result (many peeps have been exposed so have antibodies without knowing it)
in fact for anyone wishing to have children its far better to be exposed prior to pregnancy
Mind you i didnt go out of my way to infect myself before baby no 2..and as far as i am aware i am still negative.