I've been in this hobby for a long time, and only heard of him for a few months now.
It's not his fault that you didn't hear about him and his work. That doesn't say anything about quality. And - no offense - I ask myself, how much you are into high quality kitchen knives outside the US or this forum , if you didn't knew him before. There are great knife makers in Europe, Xerxes is (one of) the best.
And in general: I find it disrespectful (this doesn't go against you in any way, @AFKitchenknivesguy I think you are a great guy from what I have read!) that he is charged by one knife that costs 4K. He is normaly under or around 1k which is absolutly fair in my opinion. I bought a 21cm laser custom once for 376€. And he is planning on a new production series knife which will be around 430-450€.
To all who don't know his work: Get one of his knives, test it and than we can talk again.
Best,
Mack