...I was particularly surprised to note that after running 32km of a marathon, this gentleman cranked out a low 36 min last 10km...
Well, glad for the DQ if that's true. I reported a Masters guy who ran a 5:58 min/mile 5k split en-route to a 3:12 marathon. The RD said "he could have been in that kind of shape". Sorry, a 3:12 marathoner does not drop 5:58 miles for 3 miles during a marathon. When you're a runner, you know how hard 5:58 miles feel like compared to 7:20/7:30.
Sure enough, doubler picked up this exact guy at another race DQ'd cheating into Boston, and posted on him in 2017! He left out his name, but it got him to stop. The guy never cut courses again. In this 2015 case, it was very obvious where he cut the course. He cut before mile 20 too. His result from this marathon still stands. I don't think it should, but it's not like he won the age group. Rare case where the runner learned his lesson.