https://www.reuters.com/sustainability/boards-policy-regulat...
“The lawmakers said a recent analysis by a commercial company provided to the committee indicates that these devices may potentially collect and transmit extensive user data -- including sensitive personal information to servers under Chinese jurisdiction without explicit user consent.”
>indicates that these devices may potentially
Translation: they could do that (just like everything else connected to the internet), but they don't? (hence you never heard of that probe again?)
They could do that according to an unspecified "commercial company", as reported in an article titled, "Lawmakers want US Commerce Department to probe Chinese smartphone maker OnePlus".