Splitting hairs. It does not say perfectly vertical . It may mean more verticle than horizontal.
You do not have enough money to fight this, and would probably lose .
There are some internet "reports" of bullets coming apart in suppressors and causing baffle strikes.
Take it all with a grain of salt, like ALL internet "reports".
I believe @Nonliberal chimed in on this years ago. While he doesn't recommend it, he did clean the baffles a time or two with stainless pins and found no damage whatsoever.
Buy once, cry once. I made the mistake of buying a cheep 22 can. I regret it every-time I use it. A good can costs more then 200 bucks.
QuietRiot is the place to go.