If they can't see the labels at night so what? They use their daytime experience of expecting it to be automatic and wait awkwardly for nothing... or they push the button and the light changes eventually.
IMHO the biggest problem here is that the label doesn't meet the usual standards for road/pedestrian signage. In particular, "real" road signs are retroreflective so that you can see them easily under streetlights (or in car headlights). This is particularly important for signs that are only relevant at night. (Semipermanent signs should be made of a sufficiently durable material, which this...is not.)
Most of Australia also doesn't have these buttons as far as I'm aware.
So that's not most likely to be the default assumption at all.
SURELY one always looks out for traffic, even if it is green for you!
1. At intersections with "leading pedestrian intervals" or "exclusive pedestrian phasing," walk signals provide unique safety benefits that reduce the risks posed by oncoming traffic.
2. This can be important: due to road geometry or other obstructions, it can be hard to see oncoming traffic from a distance, especially for the visually impaired.
3. Blind pedestrians can hear audible walk signals, but cannot see oncoming traffic at all.
4. At sufficiently complex intersections, it can be impossible for you to tell whether stopped cars are about to come towards you when a light changes.
5. Most importantly: walk signs usually tell you how soon a light will change, so that you don't start walking just before a light change.
This is why walk signals reduce car-related fatalities, particularly at night, when people are most at risk.