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.
I've been trying to work it out and the best comparison I've seen is this: https://i.imgur.com/MhM1fap.png
Although https://www.reddit.com/r/hardware/comments/138lari/comment/j... indicates it is a reasonable match.