I don't think it's as far as you think it is. I'm not a fan of this guy, in fact, this is the only video I've ever been able to sit through. But he does a fantastic job using the PCA's video evidence to plot out the Elantra's movements in real time. And it lines up perfectly with the leaked surveillance video.
If he can do this on a PC sitting at home I'm sure prosecutors will be able to show the jury the roads BK likely took.
Also, is the expectation that every single second of the Elantra's drive be captured? Or at every intersection? Prosecutors get convictions all of the time with 0 evidence on roads a person took. Just based on the fact that they have the opportunity and no alibi to account for their whereabouts.
I do think they have to explain why someone living eastbound from Moscow was allegedly travelling westbound from Indian Hills Drive. The PCA for instance makes a big deal about Palouse River Drive but leaving Pullman there's no footage of him on Johnson Drive. Although there's many backroads permutations you can take once you're on Johnson, Johnson is the chokepoint and has at least one camera. If he for instance got on the 270 to go westbound rather than eastbound he could have taken the backroads using Wheelan Road for a northern backroads way into Moscow but then that starts making the defense's case that he was out just driving around and it makes it hard to put him on Indian Hills Drive if he used northerly backroads rather than southerly backroads. I do think he did it, but I do think there's a risk that at one or more points LE misidentified Suspect Vehicle 1 where the defense could show they got the wrong car at certain points and create reasonable doubt and it's also possible that Suspect Vehicle 1 was a 2011-2013 Elantra as originally identified.