This is crap
but not even ignoble style crap because it was so crap at what it did. It'd be ignoble-type-crap if it did a decent job.
What a waste. Also 2 minutes shaking?
Rather than theorising on the sides of the inside of the can thing could they not look at something in a clear container? If only glass bottles were a thing although plastic is also a smooth surface
With a tiny amount of time musing on it:
1) If you shake something for 2 minutes and then open it can anything stop that? We're talking drops or mild agitation usually - this is absurd.
2) Isn't blinding it overkill? We /know/ if shaken they do this, I'd get one or two controls, but ~ 250 of them? It seems absurd to randomly treat them like that but not consider the opening technique either.
Also you could probably do better making a simple model of pressure against "can tugidness" (Finally a use for that word!) - if you squeeze a container, it depresses slightly, this you could measure and use for internal pressure on cans and plastic (but doubtful with glass unless VERY sensitive) - I'm thinking like "get a flat metal bar, glue a small mirror onto it, clamp a laser pointer with the button on, work angle backwards from that (the laser goes near enough dead straight, and the mirror means you can "amplify" the deflection due to depression of the can)
I'm thinking a simple vice, a metal beam fixed at one end with a weight on another, a can mounted in a U shaped bracket and this thing allowed to lean on it.
If they cared enough to do it, why not do it right?