I've run in several hundred track races over 40+ years, indoor and out, and I'd be hard pressed to see how you make a disqualification out of that, unless a head on video (probably not available) showed something radically different, as sometimes happens in horse-racing.
The runner in red succeeds in passing the runner in white half way down the straight, and he hasn't been impeded, broken stride, or lost momentum at that point. The runner in white then rallies and squeezes by, while the runner in red dives for the line and falls. The runner in red is on the inner edge of lane three as he comes alongside (18:40). At 18:43 hes started to come back in and by 18:45 he's almost all the way back into lane two, with only his right foot on the line between lanes two and three. The runner in white once he'd drifted out coming into the straight has been on the inside of lane two the whole time. At 18:47 the runner in red is back in lane two, his left foot almost to the centre of that lane. By 18:48 he's drifted back out again, and his left foot is on the line between lane two and three. The runner in white, who has kept a straight course is now back nearly alongside.
At 18:48 the runner in red has drifted back in again and a couple of frames later his right foot on the line between lanes two and three. At 18:48 the runner in white looks as if he's been edge towards the inside of lane two, and is actually leaning away somewhat. At 18:50 there is a point where they are virtually touching, the runner in white having come back into the centre of lane two and the runner in red being almost all the way back into lane two. The runner in white then gets back into the centre of lane two, but he's now ahead. At 18:53, the runner in white has drifted out and his left foot is on the line between lane two and three, the runner in red is making despairing dive at the line.
It doesn't appear to be anything more than two tiring runners battling to the line. Once he's made his - permitted - drift into lane two at the start of the straight, the runner in white keeps a straight course for most of the straight, and doesn't make any move to stop the runner in red moving by. Once ahead, the runner in red drifts in and out and does appear to take the runner in white's ground to a small degree. The re-pass by the runner in white is clean, and then he drifts out late, although it doesn't seem that the runner in red would have been able to come back. The fall was a result of the dive to the line.
You can't expect two tired runners to finish as if they are on rails. The runner in red probably altered course more than the runner in white through the last 6 seconds or so. The result wasn't affected, the runner in white won fair and square. None of it look like intentional fouls.