Nobody wants to admit it, but most of this tech has been driven by (and often funded by) the prohibition of marijuana. Due to the extremely short spring/summer in most of Canada, indoor grows became the norm, and much of that technology/knowledge was transferred over to these locations almost decades later.
When legalization occurs next spring, you'll see lots of these greenhouses switch to the new cash crop.
Having some climate/AQ control systems does not make a setup advanced. I'm not claiming there is not a single illicit system that has some automated equipment in it, the gp's claim was that current greenhouse tech was developed in/for mj growing ops, which is preposterous.
I'm not an expert, but while hemp in general might be a fairly hardy crop, the strains of cannabis prized for their cannabinoids might be a little more finicky. Hemp can endure a wide variety of molds and diseases and keep growing without losing much yield, but this might be less of a virtue in a crop destined to be commodity-graded for human consumption. Also, I'm given to understand that the intensity of the sunlight available to the plant is a major factor in determining the potency of the final product. I would be surprised to learn that any of the excellent marijuana grown in Canada was planted outdoors.
Combine that with how responsive the yield and quality of harvest is to intensive cultivation, and it seems a more likely competitor for greenhouse space in Niagara than for acreage around Tillsonburg.
When legalization occurs next spring, you'll see lots of these greenhouses switch to the new cash crop.