He wasn't introduced as a nazi, none of those MP's knew the truth about who they were standing for, and they wouldn't have if they did. Somebody didn't do background research, and old nazi never should have been anywhere near parliament. It's incompetence all around.
He was introduced as having fought the Russians during WW2, there's literally only one option as to what side that leaves him on. Either parliament is completely devoid of the most basic history education, or they knew damn well what they were applauding.
IIRC, he fought the Russians to protect Ukraine from their invasion. He had no other allegiance to Germany or Nazis. It was a "the enemy of my enemy is my ally" situation.
He volunteered to be part of the waffen ss, they mostly terrorized the civilian population and helped with extermination, they weren't involved in actual warfighting that much and when they did fight they lost badly because they weren't meant to be military, they were meant to terrorize civilians and help with extermination.
Most Ukrainians fought for their country as part of the red army. Something like 28:1. The nazi collaborators of the waffen SS like the fascist who was celebrated by the Canadian parliament mostly did "antipartisan activities" which involved killing a bunch of Jewish people.