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My kneejerk response when I saw this was "it probably doesn't make a lot of sense", in that a tank is designed for human use.
Like, a lot of the constraints that tanks are built to are because they need to have humans onboard.
Like, if you don't need people onboard, you'd build a tank differently. You could make the thing a lot smaller. Same reason that, for example, UAVs generally don't look a lot like manned aircraft.
But one thing that I did wonder about...I know that Russia has a number of really elderly tanks. They've been reactivating T-54s. Those are not going to have great protection against modern weapons on the modern battlefield. But...if they aren't great in their original role, but could be converted to be unmanned, make them more-attritable, that might make more sense.
The article also mentioned the possibility of converting "older vehicles" at the very end (though it spent more time talking about specialized unmanned vehicles, like mine-rollers).