I'm a little confused where the inventor is heading with this, but I think he is wrong about the work from the capacitors.

When in parallell, the capacitors C will be charged with the same voltage within time T. The capacitance is 2xC at a given voltage 1xV, and the charging time is 2xT.

When the switches turns the capacitors into series, the total voltage V is 2xV, but the total capacitance C is C/2. So the discharge time is reduced to T/2, enabelig the capacitors to discharge fully and not partially.

Vidar