You should read a bit further, I think only your last assumption is correct: there is indeed no desktop client for Mac, so you have to use Windows to design das

You should read a bit further, I think only your last assumption is correct: there is indeed no desktop client for Mac, so you have to use Windows to design dashboards/reports. There are web, native windows, android and ios interactive report viewers. With a single paid license you can publish to the cloud and make reports available to anyone, even embed it in a website or app. There's even a Redshift connector in preview.