The resistors are "house brand" for lack of a better term - I get them custom manufactured. I haven't talked much about them much, but they are 0.5% tolerance and would check all the boxes for audiophile grade. They're pricey compared to Xicon or KOA Speer but worth it to make kit building easier (no color codes to read) - and just because they're red!
They're very similar to the ones made by Precision Resistive Products like VFE used to use. It's not that brand, but the resistors themselves are pretty close in specs, if someone wanted a lead on ordering some similar ones.
Just noticed how cool those red resistors look! Attention to detail in these kits is unreal, even the jacks match the Wimas. Thanks to Gordo for the build thread, I have been curious about this project recently. Aion, are those resistors similar to the sausage brown Dale/Vishay brand?