Earlier in the day, Racing NSW also brought forward the barrier draw "to circumvent any security risks that may exist".
The original plan by Racing NSW was to hold a live barrier draw and project the results onto the Opera House facade, alongside the jockeys' colours and barrier results alongside The Everest logo.
The Sydney Opera House initially rejected the proposal but a state official overruled and allowed a revised 10-minute projection of the ad for October 9.
Sleeping Giants Oz issued a statement to AdNews, saying: "Sleeping Giants Oz fully supports the action against allowing the Everest Event to go ahead at the Opera House and applaud everyone who supported the petition". It should be noted that Herron was upholding the statute of the Opera House in doing so.
Hundreds of Australians flickered torches on Tuesday at the sails of Sydney's Opera House, aiming the light rays to disrupt horse-racing advertisements projected on its facade, in a protest against the use of the building to promote gambling.
A protest is being planned for when the projection takes place, at 8pm on Tuesday night.
Racing NSW says bets have been suspended "to avoid any perceived integrity risk", with waging operators to be informed later this evening when they can recommence betting on the annual racing event.
It comes at a time when there has already been significant backlash after radio host Alan Jones stepped in to implore NSW premier Gladys Berejiklian to allow The Everest to beam images on the Opera House's iconic sails.
Satirical group The Chaser posted a video of the prank on Tuesday morning where they can also be seen shining the message, which was accompanied by Alan Jones' purported mobile number, onto NSW Parliament House and the NSW Art Gallery.
State and federal politicians have weighed in on the stoush, including Prime Minister Scott Morrison, who believed the promotion of the event was a "no-brainer".