It was in police custody, hence the policy of an inventory check. I suppose you'd rather the officer take it on the chin when he doesn't do the inventory check and the allegation comes in after the fact.
I think that you need to read the decision. By his own testimony, the officer was not planning on taking possession of the vehicle. The search was patently illegal. Calling it "procedure" doesn't change that.
http://www.canlii.org/en/on/onca/doc/2016/2016onca248/2016onca248.html