It's been a while since I read the article, but I took Cordesman to be referring to Hezbollah's infantry forces. That is, describing the threat of cheaply upgraded enemy infantry to a mechanized force.

Hezbollah used ATGMs, drones, mortars, and rockets to support a light infantry force. They also made extensive use of fortification, camouflage, and deception.

Western forces could upgrade their infantry with similar capabilities, but only if they were facing a similar threat. . . .