Menards is a retailer like Home Depot and Lowes.
AFAIK, Menards does not manufacture shingles.
Atlas is a major shingle manufacturer based in Atlanta.
Like everybody else, the Atlas shingle warranty is "limited lifetime", not saying that covers much but the days of the 20 and 25 year warranties seem to be gone.
The Scotchguard treatment involves 3M copper roofing granules and is described here:
https://www.atlasroofing.com/roof-sh...hgard-shingles
When I had my last roof replaced in Fla I looked into having zinc strips installed on the ridge lines but it didn't happen due to cost.
The washing of zinc helps kill algae (why you don't see black streaks in the area below galvanized roof vent stacks and the like). My guess is that the washing of the copper granules is also lethal to algae and rather than install strips they incorporate them into the granule mix.
Trying to control algae black streaks on a shingled roof is a real thing in the south. I don't see the Atlas idea as a gimmick at all.