TestFlight - Install iPhone (iOS) apps on Mac (macOS)?

If I have built an iPhone (iOS) app in Xcode and want to send it to external testers but some of them don't have access to an iOS device like an iPhone, will they be able to install the iOS app via TestFlight on their Apple Silicon M1 Mac (macOS) instead? Or does TestFlight only allow installs on the target OS?

TestFlight - Install iPhone (iOS) apps on Mac (macOS)?
 
 
Q