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It’s a pretty nifty app: you download it and you have “Flotato.app”. If you want a “Gmail” app, you copy Flotato.app, rename that copy to “Gmail.app” and open it. It will open Gmail, and the app icon changes to the Gmail logo.

So far this has worked consistently for more or less every site I tried.

Isn't that just the same as installing a PWA? (https://developer.mozilla.org/en-US/docs/Web/Progressive_web...)

Exactly but with the benefit of using the Safari engine and some other bells and whistles

Safari can install PWAs using the Safari engine while also taking advantage of the same Content Filtering API measures you use to get rid of crap.

I am not sure what this product really achieves.

For anyone curious, the GNOME Epiphany browser on Linux has this feature as well. Incidentally, it's also based on Webkit2-Gtk internally (Webkit is the Safari browser engine).