Actually the answer is - yes it will run on Apple Silicon either way.
If the web-app: then that's dependent on the web browser (so if you run it in Safari then it's running on Apple Silicon).
If the native-app (App Store) then no, it will be Rosetta 2 because the change log doesn't show any updates for 5 months.
And I guess for the native app it could just be running in WebKit rather than being a full-native app, in which case I assume that's now Apple Silicon also. Although maybe that requires the developer to first cut-over the base-app in which WebKit is embedded first (probably - I know that's the case for a lot of integrated software - it's one way or the other but not a mix of both).
But either way, I doubt you'll even notice a difference whichever the answer.
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