ASX and NSX are market operator. ISX is not a market operator so no tier.
You quoted the reference completely wrong.
The case would have arisen if ASX didn’t enforce the listing rules per se not suspending the ISX (If ASX suspects ISX has breached the listing rules), then (a) to (d) above may make an application to court to demand ASX enforce the listing rules that is ‘suspend the ISX from the official quotation’.
ISX Price at posting:
$1.07 Sentiment: None Disclosure: Not Held