The energy usage to attribute to employees should be proportional to the number of employees more than anything else. There's no a priori reason to expect that a "Bitcoin employee" uses more or less energy than a "VISA employee."

So as far whether or not that matters... do you expect that there is a substantially different number of employees need to maintain the VISA system than the Bitcoin system, on a per-transaction basis? Even if you're generous and say that VISA needs 10× the employees that Bitcoin would (were it the same size as VISA), it would still require that an employee use 100,000× the energy cost of a transaction to overcome the fact that Bitcoin transactions require 1,000,000× the energy of VISA.