The gyroscope argument works the opposite way.
A gyroscope maintains its orientation in inertial space (relative to the distant stars), not relative to Earth's surface. This is exactly what we'd expect on a rotating Earth.
If you set up a gyroscope at the North Pole, over 24 hours you'd see the Earth rotate beneath it while the gyroscope's axis stays pointed at the same stars. This is essentially what a Foucault pendulum demonstrates.
The gyroscope doesn't follow Earth's rotation, which is precisely the evidence that Earth is rotating.
This is as solid as physics gets. It's not theoretical; it's observable, measurable, and used in technology every single day.
