In the future it might help.
It might, which is why I got it done. But so far it has proven useless.
All logic is totally out the window. Israeli Ministry of Health says that this is what their professional advisors decided, and there's no overruling it. I can present with 10 consecutive negative PCR tests and a positive antibody test, if I didn't have a positive PCR test there's no way to be allowed to exit quarantine earlier than 14 days (nor to board a flight back to the US without special approval).