I can't watch the replay as I am on a phone, but I can almost asure you it was a maxcontacts. Maxconcts isn't a glitch it's basically the maximum amount of objects to be touching other things, to allow for the dq to register iirc. If you're in a public sever I think it's always set to like 20. If you're in a private server it is auto on 8 so I would recommend raising it up a bit to avoid this.
Otherwise when it happens be sure to let go and try to make sure you get anything touching them to not touch them and they'll dq.
Watched the replay, was maxcontacts indeed. It's not about the amount of bodyparts touching the ground, it's about the amount of bodyparts touching anything, including your opponents body and the ground. In this replay both your toris were so close to each other that the amount of places where you 2 had contact exceeded the maxcontacts, thus preventing the dq.
As mrmiyagi said, best you can do is ungrab and try to push yourself a bit away to remove some contacts and hope he dqs.