That's a good deal for 1500 AUD. The Ryzen 7 250 might sound weak based on category alone ("two gens old", mid-midrange), but it's still a Zen4 Hawk Point 8C/16T little guy at 26-30W TDP, comes with a quite performant Radeon 780M (meaning you could game on it without the RTX, even!), and it easily goes toe to toe with the Apple M4 (regular base model, non-Pro/Max!).

What this means is that while the dedicated GPU is disabled, you should get pretty solid battery life - up to 5-6 hours I reckon - while also being able to game with slightly better performance than the Steam Deck, AND with the dedicated GPU - usually while connected to mains - you'll get proper performance around 90-120fps on high/est settings in most games.

Oh, and one more thing. You might've spent a bit more than you intended BUT you bought a more future-proof hardware at a steep discount (you spent 25% more than intended, the seller got 25% less than intended). That laptop will last you about as more in time as much more as you spent on it.