There is absolutely zero evidence of this. None. In my opinion it's baseless speculation.
It's far more likely that they are upset over being called out, and are out of touch with regards as to what is ethical testing.
From TFA: “The UMN had worked on a research paper dubbed "On the Feasibility of Stealthily Introducing Vulnerabilities in Open-Source Software via Hypocrite Commits". Obviously, the "Open-Source Software" (OSS) here is indicating the Linux kernel and the University had stealthily introduced Use-After-Free (UAF) vulnerability to test the susceptibility of Linux.”
Suggesting a foreign government could be leaping to conclusions as well, given domestic activists with an agenda may do the same thing. A linux kernel backdoor is valuable to a lot of different interests. Hence why counter-intelligence should be involved.
However, I just looked at the names of the people involved and I don't know. Even if they were Taiwanese, that's an allied country, so I wouldn't expect it. Who were you thinking of?