Please understand that the "platinum" category only means that it works with blob-less distros without any major feature missing. If you want schematics, yeah, that will be nice. But NO.
Company won't give you their product schematics just for some Freedom bluff. And take a good look at Purism, they make freedom by building it from scratch. And not even Purism published their schematics for reasons, why? You sure know that schematics brings freedom, but this will also allow copycats to kill Purism's business.
So if you want schematics, well, be a superhero and hack into HP or Dell, bring the schematics and expose it on Tor, or start drawing your first board.