A Prediction of Chemero's Theory of Cognition?

In RECS, Chemero writes,

I take it that cognition is the ongoing, active maintenance of a robust animal-environment system, achieved by closely co-ordinated perception and action.  Radical Embodied Cognitive Science, p. 212.

So, is it a prediction of this theory that a normal human being who is subsequently completely immobilized by neuromuscular blockade (hence cannot act) and who has all cranial nerves severed (or whatever) (hence cannot perceive) not a cognitive agent?  That seems to be an implausible thing to predict.

It seems just like predicting that a computer with all of its peripherals (keyboard, mouse, monitor, speakers, etc.) removed is no longer a computer.