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The MIC substrate which they have used looks like Alumina oxide (Er = 9.8 - 10.1) and the resistors are probably of Nickel chromium (NiCr). A long long time ago I have even designed those kind of circuits on this substrate. I’m more in the chip design now so I have to dig deep in my memory. If the gold layer is damaged or gone than the lossy NiCr layer remains.
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Thanks! I just looked up the specs for this material and it is very impressive with a very low loss factor. I think the metal losses will dominate the substrate material losses in this case but this does look to be a very nice PCB material. I've never worked with it but I will investigate it further as the thermal properties look to be very good too.