I got that there was only one time that he mentioned that it fell out of TC. And then couldn't reproduce it at all. The taking on and taking off the tanks was to show how the resistance lock worked when on and off. In that, with the lock on, the resistance showed it had changed after removing and replacing the tank, but then firing the button put it back into the locked setting. That had nothing to do with the TC falling out. edit: Thanks foggybottom for this correction.
Phil sometimes goes into the reviews 'cold' without reading all that's been said on forums, etc. - which imo, can be a good thing. He did mention the battery mAh 'situation' but other than that, it was pretty much a 'cold review' unbiased from other opinions. On the stealth mode, for example, he could turn it off and on but didn't know (or didn't point out) that you can get a short view of the settings even if in stealth.