His radar explanation for FLIR doesn't really hold well if you take their stories into account though. There's a limit to how far away it could have been since they're saying they saw it near sea level below where they were. He also doesn't explain why the jet engines of said plane didn't show up as a different color on the IR camera.
Eyewitness testimonies are not very reliable, no, but unless they're lying, there was definitely something unexplained going on there. It's possible there's an explanation which covers all of it, but Mick West's doesn't.
Not to mention that he's a game developer and not an aerospace engineer. I really doubt he has any experience using the systems that he's explaining. I would love to see that video "peer-reviewed" by someone who has the credentials to talk about those things.