You may say "ok, we don't have yet the beurocratic apparatus to accept natural immunity in our protocols and for the time being we're going to focus on vaccinated people, sorry".
You may not say "we want to force you to vaccinate, that's the whole point, duh"
That's a dangerous attitude. It feeds vaccine skeptics or denialists, who use this attitude as a proof that there is as much dogma in the "official scientific community" who are in big pharma's pockets. They are a bunch of nuts, but they are infecting otherwise reasonable people I know all around me.
Let's avoid setting up official policies and discourse tones which effective feed the trolls.
They are only going to let people in they want, and they don't want people who could spread the virus, or bring it in.
Besides they are allowing people in with natural immunity too - as defined by a positive antibody test.
This is about what other countries want to restrict in terms of non-citizen's entering the country without isolation.
These are countries which have had a significant portion of their economy shut down for more than a year, so unsurprisingly they might want to ensure non-citizens who travel in have done something to limit the risk (even if that is isolating for 2 weeks).