Since there are no set guidelines for how equipment is measured, manufacturers can often give you bogus numbers when compared to other products. THD can just be the lowest % on the audible spectrum, or an average, or the peak. Same for IMD. SNR can be measured where volume is extremely low, and an excessively high number can be extrapolated.
I stopped reading for manufacturer specs and started looking at measurement graphs a long time ago. Otherwise, false advertising would just win (and usually does, for the uninformed).