Yes - per liter of pure ethanol. If you buy a pint of regular lager beer you are buying basically 0.56L times 5.2% alcohol which is 2.9 cl pure ethanol, or as a brit would some times say "about 3 units". So a minimum proce per unit is the same as a minimum price per litre of pure ethanol. The minimum price per liter of ethanol is 100x the minimum price per unit (since one unit is 1 cl pure ethanol).

The reason this is so fantastically confusing is because sometimes even regulators use "alcohol" to refer to the drink, and not the ethanol.