Afaik there's no LCD screen with better contrast than a OLED screen. So no, Switch 2 LCD screen is no better than Switch OLED.
Where did you get it done for 150 AUD?I got my OLED chipped a few months ago for 150 AUD and with a sandisk 1TB microSDXC haven't looked backinstalled a pretty HALO theme and lots of great games.