It all depends on timings but if as he says in the article he did the run-ups and left it running 'a bit longer as I did change tanks, something I would not do in my Mooney' it is may be a bit less likely that fuel starvation due to a feed problem from the tank was a problem.
This would further be supported by the fact that changing the tanks as attempted made no difference.
The way to assess what works best for your regular mount is to change tanks with different power settings and see how long it takes for the engine to start spluttering and how long it takes before it picks up again after resupplying the fuel.
Gladly the guy was OK, shame of the Cub.
FNG,
That is indeed a brilliant site, isn't it.
FD