I think a number of you are missing a much wider and more serious point here, beyond that trail being rideable or not and who with and who not. So put your testosterone down, handbags away and think of both the injured rider and wider implications.
Surry Hills is under increasing pressure (from all parties) regarding use and anything that highlights the danger or not of trails is not good for those that use the area, those that live there, and those that also get injured there.
Proper trail grading, maintenance and ROW’s is what the nimby’s will call for and the attitude displayed by some on this thread only hastens this.