Foreign laymen here: if these are true, would they be considered treasonous?

Not in the US. The US has a very specific definition of treason in its constitution, and this case would not fit it.

"Treason against the United States, shall consist only in levying war against them, or in adhering to their enemies, giving them aid and comfort. No person shall be convicted of treason unless on the testimony of two witnesses to the same overt act, or on confession in open court."

Trump knew about the spy. For a Year. So any selling of GPU's might have had some under the table agreement. The US allowed it. Maybe this is why China helped with the oil crisis.