He basically does detail monthly costs. You're implying it costs him about $833 a month to run.
His gig internet is $80 a month: https://www.centurylink.com/fiber/plans-and-pricing/seattle-...
His wifi backup internet is $40: http://www.gigabitseattle.com/residential-services
He specifically states the setup draws 220 watts at idle and that his electricity costs $0.0974/kWh. So 22024/10000.0974 = 0.514272 per day, or about $15.40 a month at idle.
So around $135 a month.