According to harris's site, "In addition to custom wheels, we offer stock wheels, machine built unless otherwise indicated"
So I would say it is safe to assume that they are machine built, probably by another company.
A machine can lace a wheel. A human can lace a wheel. 20 years ago I loaded an italian wheelbuilding machine. It only did the lacing and drew up the nipples. It was trued, tensioned and stress relieved by a human...Me. The new machines do the whole enchalada. Reasonably well. Can you when you buy a wheelset tell if it was hand laced, tensioned, stress relieved and trued by a human by looking at it? I have been building wheels for over 20 years. I have no issues with machine built wheels. I do stress relieve them, check tension and true em' and work em' over before I sell em'
They are fine.