Lol, never trust these tire walas and desi ustaads.
The opposite happens when you under inflate in peak summers. More friction with the tire and more chance of bursting.
Vitz has 36 front and 34 back in stock tire size. Been working perfectly in peak heat.
However do note one thing. Tire pressure is measured when the tires are cold.
If you’ve been driving and go to a tire shop to randomly check, it’ll show much much higher pressure because of gas expansion (all normal, tires handle it).
Never fill / take out pressure when tires are hot.
Either get a compressor for your car so you can fill before taking it out first time of the day.
Or
Drive slowly to a nearby tire wala guy to avoid tires getting hot.