Infelizmente, seu navegador não é compatível... Safari Versão 14.1.2

[merefield (Robert)]

About support for legacy browsers

They aren’t. Our official browser support policy is the latest version of Firefox, Chrome, Safari and Edge.

e mais especificamente:

Unsupported browser message on Snap! forums

Yes exactly - we’re using the lack of aspect-ratio as a way to detect older browsers. There are other, more critical, things we now using (e.g. the optional chaining operator) which tend to be unsupported on browsers which do not support aspect-ratio. Our list of supported browsers can be found here. We currently supports iOS 15.7 and above (which is supported on Apple hardware released from 2015 onwards).

O que sugere que você pode se safar com >=15.7 no macOS