Has to agree to what? I thought reviews were between the reviewer (host/guest) and the platform, and that the reviewed party can only see it after they submit their own review.

In my case, there was not even a chance to write a review, not that I wrote a review and it didn't appear anywhere.

It seems that Airbnb's policy effectively hides the worst reviews (ones where the guest is moved to another unit and the host terminates the stay in a way that prevents a review from being possible), which contributes to the 'grade inflation' that we see in Airbnb ratings.

I’m a host. How do I do this? I’ve never had the ability to hide reviews

They didn’t hide a existent review. They canceled the stay in a way that made it disappear from our dashboard so that we couldn’t review it.

Dispute a review. Offer to pay back partial funds to get review removed.

That's not at all the same as what was claimed in this thread that hosts can prevent a review from appearing in the first place and that hosts have to allow the review before it's published.