As the pax in question allegedly made threats against the aircraft (along the lines of having an explosive device on board), not really, no.
There isn't really anywhere else at SYD to isolate an aircraft in this situation that wouldn't take a runway out of service because of proximity to terminals, other aircraft, refuelling infrastructure, public roads, etc. They could have isolated it on 16L/34R or a taxiway in that part of the airfield but the effect would be the same and there are other assets in that area that need protecting, and more difficult in terms of emergency response.
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