I think he is saying that in order to pay the salaries for those new jobs, taxing robots as if they were employees might be fruitful. As in, there's not enough

I think he is saying that in order to pay the salaries for those new jobs, taxing robots as if they were employees might be fruitful. As in, there's not enough economic demand for those roles at the moment, and in a future where there is a true surplus of human labor due to automation, it might make sense to design a tax scheme that mitigates the issue of wealth concentration in robot owners.