No, it's a great benchmark for
consumer grade pres. With very, very few exceptions, we are not talking about old models of high-end pres when we discuss pres built into audio mixers or other audio gear.
Most audio gear with embedded pres typically use the nicest parts they can get for a couple of bucks per channel. Even a Burr Brown design costs only about three bucks in bulk (pots, power, case, knobs, jacks, etc. not included in that price). $2.90 for the chip plus a couple of resistors. And that's for chips that are at or near the high end as far as consumer pres go. Consumer gear goes down from there.
Because the price of low-cost op amp chips drops as better tech comes along, the quality that you can get at a given price point improves almost linearly over time. Thus, I can say with confidence that low-cost op amps built fifteen years ago (and, by association, most gear with built-in pres from that era) almost universally suck compared with all but the cheapest preamp hardware still built today.