I should have read the video description... It does have a 130mm gun.
> A new tank for a new era: Panther KF51 is Rheinmetall’s new main battle tank, setting unprecedented standards in lethality, protection, survivability, reconnaissance, networking and mobility.
> 130mm Rheinmetall Future Gun System, open digital architecture, comprehensive protection concept with passive, reactive and active technologies, including KE protection, and Top Attack Protection System, further armament options to provide concentrated firepower for long-range strikes and against multiple targets are just a few next-level features that render Panther KF51 a revolutionary response to current and future threats.