Open with Rosetta not available

Solution 1:

Intel-only binaries automatically open with Rosetta 2, there is no other way to run them. The "Open using Rosetta" flag is only relevant for universal binaries (which contain both Intel and ARM code) to force them to open with Rosetta (e.g. if they require plugins only available as Intel binaries).

From If you need to install Rosetta on your Mac

The Info window for universal apps includes the setting “Open using Rosetta.” It enables email apps, web browsers, and other apps to use add-ons that haven't been updated to support Apple silicon. If an app doesn't recognize a plug-in, extension, or other add-on, quit the app, select this setting, and try again.