Seeing an Asian (any part of Asia) name wouldn’t give me any pause in the slightest. I don’t want to start anything here, but aren’t they disproportionately represented in the American software industry as compared to their percentage of the population?
What would raise my hackles would be someone with a name that codes western who had grammatical idiosyncrasies common to ESL Asians.
So, a couple of thoughts, this likely be chosen in the event that they wouldn't be caught, not that they were. Thus, them choosing a Chinese sounding name to frame China or to go along with the narrative of China being the evil communist country (etc) doesn't really make sense. Also, even if they did that, only westerners would be fooled as others have pointed out "Tan" is a dialect surname (hokkien may be), pointing to someone in Southeast Asia, not mainland China.
A better assumption imo is they chose their identity first and foremost with the intent to garner trust first with Lasse Collin.
What would raise my hackles would be someone with a name that codes western who had grammatical idiosyncrasies common to ESL Asians.