Specifically olive oil might be tough, but I hope a year-long fast will convince you:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2495396/pdf/pos...
I'm not sure how you think this corroborates your claim that you can sustain your weight by drinking olive oil and water (+ multivitamin). In fact, I don't see anything remotely relevant to this in the study.
> If he were to eat that well calculated amount of olive oil everyday his weight would stay constant.
A source for this is needed. The study you provided, as far as I can see, says nothing of this. You're just assuming it's true, and I don't understand how/why.
As per your other reply to the same link
differing degrees of nutritional satisfaction per calorie ingested
Yes it's commonly thought to work that way, there are indeed differences - but they're tiny. I might try to dig up relevant papers, but as far as my memory goes, the difference was at best around 3% with certain kind of protein.