Max would literally have to admit to what he did before the FIA would disqualify him from the WDC. All he has to do is have some semi-plausible reason, and they would at most disqualify him from the race.
He literally admitted to braking hard on a highspeed straight in front of his championship rival, on the racing line, causing a crash (that would have won him the WDC nine times out of ten). The telemetry proved it. The stewards agreed that he did it. Max's punishment was inconsequential and made no difference to the WDC standings.
If you don't get a race disqualification for doing what Max did, then when is he going be disqualified? Max would pull the same trick again and be happy to take the 10 second penalty, or even a full race disqualification if it meant he got Hamilton off the track, and then pat himself on the back for "winning" the WDC.