It's only assembled in the US, so it's the honest and right thing to do to write 'assembled' and not 'made'.
I agree with you, but does it solve the underlying problem?
Let us assume that China is manufacturing backdoored components that are part of hardware wallets, and 99% of all hardware parts are delivered from China. You now have hardware wallet vendors who claim two different things. One group says made in <insert country> and the other says assembled in <insert country>. The way they explain the manufacturing process doesn't change the fact they are using backdoored Chinese hardware (let's still assume they are backdoored). If the end-users loss their money to a backdoor, it makes no difference what the website and the wallets' official documentation claimed.