I would like the people defending the DQ to show us some examples of other times this has been called a DQ.
I showed a pic of Centro drifting to the outside of lane 2 in the Olympics without getting a DQ.
https://www.milesplit.com/discussion/109254 Here is one example (although I don't have a video).
This thread also has examples from the NFHS Track and Field Case Book. Here are two of those scenarios:
5.9 SITUATION C: Coming around the final curve of the 1600-meter run, A1 who is leading, veers away from the curb and into the path of B1. As B1 starts to pass A1 on the inside, A1 changes direction to stay in the path of B1. There is no contact. RULING: If it is evident that the action by A1 is to prevent B1 from passing, A1 would be disqualified. COMMENT: It is possible for interference to occur without any physical contact involved.
5.9 SITUATION D: A1 continues to veer to the right to force B1, who is attempt- ing to pass, to run wider and wider. RULING: A1 is disqualified for impeding B1 by forcing him or her to change course. (5-13-2)