Right now, that is not possible to hide review box on non-review products.
The workaround is using Oberlo Integration Function (if you're in UNLIMITED plan) to quickly import reviews for all products just click 1 button without the need of filling product URL.
OR you can write the manually reviews for these non-reviews products. That would be great solution if you are in Pro Plan.
If you need some more helps, please feel free to contact us via live chat or email us at firstname.lastname@example.org