Back to the OP, if we were to assume that the article is a complete and accurate record of the incident (I know, fat chance, but still), then the wheelchair guy, in my opinion, is still in violation. By his own words he refused to stop when the cop told him to. Regardless of anything else, he failed to comply with the commands of an officer of the public safety and prevented that officer from carrying out his sworn duty. That is obstruction.

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I was just sitting here contemplating the immortal words of Socrates who said, "I drank what?"

"Think of the rivers of blood spilled by all those generals and emperors so that, in glory and triumph, they could become the momentary masters of a fraction of a dot." --Carl Sagan "Pale Blue Dot"