It isn't. As the Reddit link explains, the only benchmarks it wins in are synthetics.
You can play Red Dead Redemption 2 at 1080p at over 60fps. You can produce all the synthetic benchmarks in the world but this is as powerful as a console. This is the most powerful iGPU out there, it is about as powerful as 1060.
There is also the fact that the AMD CPU is newer, has a 50% higher TDP, and is built on a smaller node, but is far from providing 50% better performance than the M2 [0]
On the other hand, I don't own a Mini, nor I'm on the market for a mini PC, but I don't feel like dropping $800 for a prebuilt PC unless they provide stellar support and warranty, and chinese OEMs aren't really known for that.
You can play Red Dead Redemption 2 at 1080p at over 60fps. You can produce all the synthetic benchmarks in the world but this is as powerful as a console. This is the most powerful iGPU out there, it is about as powerful as 1060.