Earlier quoted context omitted.
I would expect him to not have worked anywhere longer than 4 months considering he just graduated and those were internships
The Full stack developer and ML engineer seem like full positions, considering he listed internships specifically in his prior experience as explicit internships. Also he has a background in bio, and managed to land a full stack and ML engineer positions, implying he is self taught, and therefore should be already fairly intelligent...but he decided to go get his MS in CS, without even doing any research project and…
This is pettiness taken to the max.
Most research people do in grad school will not have applicable use to employers. And for an MS, people will simply learn more by going the coursework route. Going the research route is good only for PhD admissions.
And finally, many universities in the US do not even offer a research route for the CS MS. They tell you to apply straight for a PhD.
If you're going to ask tough questions, at least know your domain!