Their desktop chassis and keyboard mechanics are made in the US. Where are they getting the motherboards, CPUs, RAM, storage devices, microcontrollers, etc. from? Do you think System76 runs their own silicon fab?
And even for the parts they do acquire from domestic sources, tariffs will still drive their cost of goods up. Taxes on steel and aluminum will drive the price of steel and aluminum up in the domestic market, regardless of where it was shipped from.
Could you cite something that goes into a bit more detail?
The only claims for country-of-origin I see on that page are the "US-Sourced Materials" heading which clarifies "..using aluminum sourced from US companies."
>Thelio desktops and Launch keyboards are designed, engineered, and manufactured at our factory in Denver, CO using aluminum sourced from US companies.
I'd expect pretty much all the internals are not from the US. Most of them seem to have AMD chips and NVIDIA graphic cards. I'd be shocked if the motherboards, RAM, drives, etc. are manufactured in the US.
It seems one of the least complicated parts of the system, the case, is actually made in the US.
https://system76.com/manufacturing/