It's hard to tell if the motorsports swag center-lock wheel came off this Porsche 911 GT3 RS 3.8 before it crashed out on the 'Ring, or because of it. When the wheel is flying at you while you film from the sidelines, it's not really important.
The ‘Ring experts at Bridge to Gantry point out that the crash occurred on Pflanzgarten 2, a particularly difficult section of track. The simplest explanation is that the driver lost control, crashed, and the wheel broke off. Make sure you used the right tools to tighten those wheels properly, just in case.
(Hat tip to Dale!)