Honestly I don't think that was the main issue with the test. The light dunking seemed to be the biggest issue and small(er) amounts of debris seemed to cause HIS gun issues. Could be a fluke could be endemic I don't know. Like i said my only observation is that it seemed to be undersprung and seemed to show some cost cutting side by side with other HKs. I never had any real problems however.
Like was said any gun will fail when abused or in extreme circumstances. These torture tests have brought down GLOCKS, SIGS, HKs etc. etc. on the Internet. Best thing is to know how to clear your gun.
I don't think MAC has any agenda or anything and it is kind of nice when an individual is willing to throw away 600 bucks or so to destroy a weapon not widely adopted to possibly expose any possible failure points no matter how remote they may be.
I think the VP9 is a perfectly serviceable handgun. I think it's priced well and fits fantastically well. It just doesn't have the real world testing the rest of the HK line has / LEO MIL adoption as of yet so individual single data points are all that is out there. They are data only to help in a decision making process. As far as I know a similar test was done over on HKPRO and the VP acquitted itself well.
You pays your money you takes your chances.
Beretta locking blocks fail
SIG frames crack
CZ slide stops break
GLOCKS shoot the target and you with brass to the face and the blow up
FNs melt on a hot afternoon
HK hates you and has firing pins break
Smith Revolvers randomly lock themselves
Ruger has great guns after you beta test revisions 1-3.
1911s are great as long as the extractor is just so, and they are 5 inches and shooting ball ammo, 230 grain ball ammo and are throated
Etc. they all have had their issues or endemic design problems. Much of it becoming hyperbole like above but there is some truth to everything above.
Point is there is no one true sword or caliber. Take the list of pros vs the list of cons and figure out what works best for you and learn it and prepare to mitigate any known issues. I think the VP9 is a bit less robust then the other HK offerings which lean towards really overbuilt. It wouldn't stop me from owning a VP9. I just didn't shoot mine/enjoy shooting as much as others.
I mean hell I have jammed a clean AK.