Since workers were born into a world that affirms private property, they obviously never gave it their consent.
It is just a fiction that developed its own life by the whip, blade, and gun, and also by the pen and press.
Most of the work of leftist criticisms has been simply deconstructing entrenched doctrine, to help expand consciousness, and to build capacity for liberation.
Ellerman seems to prefer instead constructing his own layer of obfuscation. It may antagonize the wage system, but it declines to deconstruct the deeper nature of moral ideals, social constructs, and legal frameworks.
It is worth becoming familiar with leftist criticisms of natural rights.