Using your flawed logic, missed mats would not prove that he didn't run as he could claim a technical malfunction with their timing system. He was smart enough to know that there were video cameras at the timing mat locations. He knew that he had to be seen crossing them, but he didn't realize is how far down the street that the video actually was filming.
Agreed, London Marathon didn't DQ Land's End to John O'Groats scammer Dave Reading in 2016 when he didn't hit a single split mat
So where the overwhelming evidence deniers seem to be going is that is no possible way of proving that someone cheated in a marathon - I will reiterate that we are talking about their claim about proof, not weaseling out of this by saying they think he cheated but there is "no proof". I am beginning to see parallels with Flat Earth "thinking".