No offense, but no. Plugging them does not make a brand new ski. The closest you could get would be plugging with 4.0mm hardwood dowels and epoxy. Then you could drill pretty freely as if they were new. But you still have unsightly holes on what were handmade, veneer skis.
Plugging with regular plastic plugs still means future buyers have to work around the existing mount pattern to give reasonable space to previous drills to prevent pull outs. I'ts common to say skis can be mounted 3 times: but that is a misnomer. That is only true if the 3 mounts (BSL, center point, and binding pattern) happen to work.
@surfsnowgirl -- this super sucks. I hope you get to ski them, but I also hope whatever person scammed you never gets to ski anything but breakable crust the rest of their life.