The regulations state that “parking control sign” is defined in the Road Rules, and the Road Rules define it as meaning any of: a bicycle parking sign, a bus zone sign, a clearway sign, a loading zone sign, a mail zone sign, a minibus zone sign, a motor bike parking sign, a no parking sign, a no stopping sign, a people with disabilities parking sign, a permissive parking sign, a permit zone sign, a taxi zone sign, a truck zone sign, or a works zone sign.

So the custom signs would not fall under the regulations.

I suspect “parking control signs that apply to the premises” mean signs indicating time limits, no standing zones, and disabled parking zones, and not the convoluted “parking permitted only in defined bays for commuters directly interchanging to rail or other public transport system” line.

“13 Driving, riding or parking a vehicle on public transport premises
…
(2) A person who drives, rides or parks a vehicle on public transport premises must obey all parking control signs that apply to the premises.”

… Those words have not changed in any version of the Regs since 2015 (I checked :), which does beg the question as to why regulations specifically referring to park and ride facilities were needed before, but to that I can only respond, I’m no lawyer.