Nobody knows the dosage in the pizza for sure since it was a cooking accident that it was dosed with THC to begin with. You don’t really measure olive oil when you cook with it, plus the distribution wouldn’t be even, so even if you do make a guess based on about how much oil you used and the concentration of the THC in the oil, it might have simply pooled more on one side of the pan if they used it as a non-stick coating, or just based on how it mixed into the dough if they mix in olive oil normally.

With the quantities involved it’s just impossible to reliably guess the dosage that any affected product might have, and with any kind of drug, recreational or not, the dosage absolutely matters a ton.