That is a practical request to help avoid damaging the rubber surface of the playground. High heels would punch holes in that surface, dramatically shortening its life, reducing its protective capabilities, and likely even twisting/snapping an ankle if the heel remains jammed in that rubber and the wearer is moving quickly.
Soooo… “Snow” in Australia’s “June”?
That’s like any lowland part of CONUS getting hail without the required anvilhead thunderstorm/tornado.
Wow. The chaotic weather of climate change is really beginning to bite decades ahead of schedule.