"unknowingly agreed"?
"But it wouldn't let him install the chip without signing a new agreement with the company, and in doing so, he unknowingly agreed to the arbitration clause."
Why didn't he know that he had agreed to arbitration? Did they send him a copy of the new contract? Did he read it before agreeing to it?
I'm in the minority in that I take time to read and understand every contract I sign.* I have, however, been bitten once by a "verbal contract" over the phone, in which I (allegedly) agreed to some contract language I never got to see — which is a yet another realm of corporate evil that needs to be explored in the courts. Wondering if that's what happened here.
(* Usually it involves me reading the text, saying to myself, "I'm getting f&#%ed in the arse," and finally signing, although occasionally there's room to bargain.)