First there is a big question mark that ozone can kill parasites this comes from someone who did 200+ treatments using medical grade ozone and another who did 300+ treatments. It never killed either worms or protozoa. So I think that she went out on a limb on this one.
Not to rain on anyone's parade.
Second is that non oxygen fed machines are questionable since 1/ they cannot produce the levels of ozone to be considered therapeutic and 2/ they produce nitrogen byproducts that are considered to be detrimental.
Ozonating olive oil takes quite some time to make using a medical grade, I think it would be better to purchase the oil.
Concerning parasites, it is always a good idea to get the proper testing to verify that in fact these are parasites and not some other organism that may require a different approach. With parasites, there are a number of different classification which require different treatments.