You can't just go to a factory or manufacturer contracted to build ThinkPad keyboards and ask them to build some of those for you, as that's proprietary Lenovo IP which can't be sold to third parties without their permission.
Same how you can't go to TSMC and be like "hey, you guys are making millions of M1 chips for Apple, ca you sell us some of those pls?"
I don't particularly think all the random chinese factories producing aftermarket Thinkpad parts are licensed to do so, but you might be correct that designing a product based on them might be a bridge too far.
Just because some shady factories are managing to fly under the radar building a handful of unlicensed ThinkPad keyboard clones without approval from Lenovo, doesn't mean it's something that Framework, or any other reputable HW maker who wishes to not get sued into bankruptcy, will want to touch with a 10ft pole for their own sake.
Or how did you imagine such a scenario would play out for Framework?
Same how you can't go to TSMC and be like "hey, you guys are making millions of M1 chips for Apple, ca you sell us some of those pls?"