Covid Vaccine Discrimination?

Seems like for this sit you will not be considered if you are vaccinated. Which I know is legal because this is a private agreement. Just never saw this before.

"We are lovers of natural immunity and even though we respect other values and ways of living, we prefer to share our space with humans who share some of these values.

When you apply, please do so stating your CV19 injections status. Applications without answering this question will be declined automatically. Thank you for your understanding."

https://www.trustedhousesitters.com/house-and-pet-sitting-assignments/united-states/hawaii/pahoa/l/1024899