I agree. Oregon doesn't field beastly defenses like UGA, UT or even Arky.
It would be nice to see how UW fared against better talented defenses but I'm not sure they faced more than one or two since DeBoer took over there.
Oregon was 9th in scoring D only behind UGA from your list, less than 1 point worse.
They were 22nd in total D, again only behind UGA who was 9th, 27 yds per game worse. Not much. Just guessing but Oregon's D is probably better than UT's. It definitely is statistically; and they're definitely better than Ark.
Oregon has an SEC type defense built by Dan Lanning with many SEC level athletes. It's probably better suited to stopping DeBoer's O than UGA, Alabama (18th) or other SEC defenses because of being built, in part, to stop UW, and having experience playing them. Oregon lost 3 times in the last 2 years to UW - all high-stakes games. UW scored 37, 36, 34 and won all 3. Oregon gave up 70 pts to UW in their 2 meetings this year and 161 to their other 12 opponents. 35 ppg vs 13.4.
UW scored 56 vs med Boise St, 22 vs a good Oregon St team, 35 vs a good Utah D, 15 in an ugly win vs a bad ASU team, 59 vs Cal who held AU to 14 (a bad Cal team, more of a reflection of AU).
Mich shut them down, holding them to 13 pts and 300 yds, Bama had 20 and 270 in reg. Tbf, UW's starting RB (1200+ yds) had to play hobbled because they had nothing else. But Mich got pressure up the middle, causing disruption.