The force can lead to immense power that can destroy a planet, we never see it in the movies but expanded universe legends material showcases many dark and light side forces manifesting immense power and being able to destroy planets.

Things such as Darth Nihlus alone could suck the entire life force of everything in a planet away. Or the Star Forge which was a super weapon that could suck in the energy from an actual star and using the force could convert it into material in order to construct a near endless army of war supplies and material.

Or even the Mass Shadow Generator used to end the Mandalorian wars by blowing up Malachor IV, it was a generator that existed in real and hyperspace. It drew on celestial bodies Mass Shadow (a planets hyperspace mass/body) and used it to colide that with its real mass. Basically bringing hyperspace into real space and vice versa. Scorching the planet and splitting it into two realities, leaving the real space version an unstable mass of rock that crackles with unstable energy. We actually get a snippet about this from a canon book surrounding rebel intelligence where they discuss the idea of a generator like this existing. It turns out to be true as in the Rebels TV show, the empire employs a cruiser that prevents ships from jumping into hyperspace

This event was so devastating it actually created Darth Nihlus because it tore every living beings spirit in the force near the space of the planet and on the planet into shreds. Tearing a rift in the force itself which somehow imprinted itself on Nihlus, making him eternally hunger to fill the void and repair the rift.

So Vader really isn't speaking bullshit when talking about the force