The macOS Claude app is absolutely an electron app, which is what the github issue in this post is about.
If you'd like to verify for yourself: On your mac, right click on the Claude app icon and click on "Show Package Contents" and then navigate to Contents > Frameworks > Electron Framework.framework.
If you'd like to verify for yourself: On your mac, right click on the Claude app icon and click on "Show Package Contents" and then navigate to Contents > Frameworks > Electron Framework.framework.