That's because to my surprise, it doesn't appear to have been mentioned by either the stewards' reports nor the reviewers'. In 7.1 of the latter, the reviewer sets out what is described as the 'relevant part of the protocol'. Oddly, that omits the key part which is that the policy must be triggered by a licenceholder expressing concern about the safety of the track.
The Track Safety Review process commences when a licensee present at the meeting notifies the stipendiary steward in charge of the meeting that the track surface is or may be unsafe to ride upon and that he or she wishes the steward to begin a Track Safety Review.
There is no report of that happening. Instead, the report suggests that the stewards themselves raised the question of track safety but I don't think that is their role. The report cites the Rule 602(1) which states what the stipes' role is.
"determine any question as to whether that day of racing or any part
thereof should be postponed, abandoned, or cancelled;"
It seems their role is to determine any question of track safety and decide the outcome. The report suggests they have not only determined the outcome but raised the question themselves when that is the role of a licence holder. They have then determined their own question. Seems a very odd process to me as reported.