Yes, more or less. "Measurable structural design" means that the design of the Monolith grinders ensures alignment of the burrs, assuming the burrs are perfectly symmetrical. There's nothing in the grinder's structure or mechanical parts that can drift and get out of alignment.
It's possible, maybe even common, for flat burr thickness to be slightly asymmetrical (i.e., thicker in some places around the circumference, thinner in other places), which could result in axial misalignment (run-out), I checked the axial alignment of both the original Monolith and replacement SSP burrs in my Monolith Flat using the marker test. Here's a link to text and photos of that project
I found negligible misalignment of the Monolith burrs before removing them, but very slight axial misalignment of the SSP burrs after installation. Probably not enough to worry about, but I was able to eliminate virtually all of the misalignment by rotating the burrs to change which mounting holes in the burrs were lined up with which mounting holes in the burr carriers (actually, I only had to rotate the lower burr.) Had there been any significant remaining axial misalignment, it would have been simple to use thin metal shims to correct. Once that's done, the alignment wouldn't drift, as is the case whether you use shims or not.
Radial alignment is taken care of by the design of the grinder, which perfectly aligns the centers of the burrs. I'm sure this is a specification Denis carefully checks during assembly. It's possible that the center hole or mounting holes could be drilled slightly off-center by the burr manufacturer, which in turn could cause radial misalignment, but this would likely result in it being difficult or impossible to mount the burr.