I agree, this should be limited to 8/8.1 and up (if it's not bugged out), a bit like the "WINDOWS 8/8.1/10 RESTRICTIONS" from the general rules which prohibit using pre-skylake HW on 8/8.1/10 if it's not valided by custom validation tools/benchmate.
For reminder : on pre-skylake HW the BCLK might affect how the RTC is generated and so the calculated taken time to finish the benchmark resulting in an invalid result, more info here : General Rules (hwbot.org)