I take the OP's point about carbon footprint, but chopping down trees is already on the negative side of the balance sheet, so you're blowing it from the jump.
Now, regarding their claims of quality issues...
If a brand specifies cheaper veneers & lower grade glue, that'll be what you end up buying/riding, regardless of country of manufacture.
DSM makes a fine pro level product, because Dwindle didn't cheap out on the material specs. The price point/toy store stuff is likely spec'd to come in at a lower cost & maybe wont last as long, but to say that a manufacturing powerhouse like China is incapable of producing top notch stuff just wreaks of veiled anti Chinese sentiment to me.
It's typically labor costs that drive companies to manufacture outside of their home countries, and in the case of the epoxy resins, environmental prohibitions as well.
Anybody that knows English cars/motorbikes well can tell you about Lucas electrical components, the problems that bedeviled them, and their reputation for failure. Made right there in the UK, so it's got to been good, right?!?
Lucas manufactured to the specs demanded by their clients, and when those clients cut corners, cost wise, in order to bring their products in a a lower price, EVERYBODY'S reputation suffered.
Their slogan was "Lucas: Prince of Darkness," meant to imply that they brought illumination to the dark night just outside your vehicle, but after a while that same slogan came to bite them in the fanny when their lesser spec'd wiring looms, headlights, fuses, etc. failed at an alarming rate, leaving motorists stranded without lights or worse, an operating engine.
All that while, Lucas had been making components for higher end marques like Rolls & Bentley, who were willing to shell out for the good stuff, and those brands had considerably fewer electrical issues.
Took Lucas half a century to shake the stank on their name.
I don't ride Chinese wood, because I've got plenty of access to stuff produced around here, but I wouldn't turn my nose up at a Chinese deck, based solely on where it was made.
Perhaps if the OP wanted, they could develop a wood free method of producing decks that perform the same as maple bloards do?
Elsewise, maybe it's a good idea to frame your position as a question of what can be done, rather than "FUCK THEM DUDES!"
How often this topic gonna come up, anyway? Haven't we discussed the matter to death already?