Another possible reason why he didn’t compare the Merason DAC1 MkII directly with the Aero could be that they were not both in his barn at the same time.
It seems Lavorgna likes the Liav Harmony DAC at its price point but he personally doesn’t care for its NOS mode, which he found boring, while he noted an etched or fatiguing quality when playing it in OS mode, but only in comparison to the more expensive LTA Aero DAC.
The LTA Aero seems more aligned with his sonic tastes, like his Totaldac d-1 unity reference, and wins within its weight class and above, but shows some shortcomings against the 3x more expensive Totaldac. Compared to the Harmony, he found that the Aero sounded "comparatively richer, fuller, and...more involving, making music feel more life-like and less processed." I will be interested to read what he has to say in Part 2 of the Aero review.
To understand his thoughts about the Aero vs. the Merason, it may be necessary to read about how he compared each to his Totaldac, which would put the Merason ahead of the Aero.