The seven-time world champion was targeted after a controversial victory over Red Bull's Max Verstappen.
The Kiwi extended his Supercars series lead after two podiums.
The Dutch driver spent the afternoon in hospital after a major accident.
The 17-lap race also served as qualifying for Monday's British grand prix at Silverstone.
British and Irish Lions star Mario Itoje has also spoken out against the "appalling" actions.
It was the Aucklander's 50th race win in the series.
The Kiwi trailed for 70 laps before making his move.
Aussie's COVID-19 border restrictions have put paid to another edition of the race, while Moto GP has suffered the same fate.
The Kiwi is 56 points back from championship leader, teammate Alex Palou.
The championship leader led from start to finish in Spielberg.
Red Bull have won four consecutive races for the first time since 2013.
The Red Bull driver dominated qualifying at the Red Bull Ring in Austria.
The reigning series champion worked his way from the back of the grid in Wisconsin.
The Kiwi ace broke a six-race winless drought in the Australian championship.
The Kiwi driver is third on points after the opening eight races of 2021.
Despite being severely burned in a crash last year, Romain Grosjean showed no fear tackling the flames.
The Swedish driver was taken to hospital after crashing into the wall.
Former winner Greg Murphy will drive alongside Richie Stanaway at the 2021 Great Race.
"People have been giving me stick about having to turn right as well as left."
Max Verstappen and Lewis Hamilton were on track for podium finishes with five laps remaining.