How is the gas amount so low for these mint transactions?

Hi, I have recently stumbled upon a few contracts which have very impressive gas fees for minting. I am wondering how this is possible because I have tested these contracts myself with both remix and ganache and the cost for doing a similar transaction is around 96k units of gas.

This transaction below is somehow doing these transaction for just above 60k units of gas. This seems like an amazing way to save the end user some money, and I'm wondering how this is even possible.

https://etherscan.io/tx/0x0969a9a5c881ef437cbd20a8880e71dfe359ae636b20d07090fb13fa402dae56