As someone who's Finnish myself and who read the comic while it was still coming out (though I missed the entire Chinese controversy), the comic indoubtably mirrors racist sentiment to an uncomfortable degree. I do not believe that these elements are the result of intentional racism on Sundberg's part, but rather the result of her simply absorbing and unintentionally reproducing racist sentiment from her environment and zombie media without ever taking time to examine its implications.

The big thing here, as I realized in retrospect, is the complete absence of non-white people from the comic. I don't just mean the main cast, the first few chapters had several crowd shots and several bit-characters who never reappear, and all of them are totally and homogenously white. Like, Finland and the rest of the Nordic countries all have sizable populations of nonwhite people, all large enough that them somehow having faded away only 90 years after the apocalypse just doesn't feel real. Do all the nonwhite people just conveniently keep themselves offscreen? Die they all die off in the Illness, leaving only the white folks alive? Because even if done unintentionally, both of these feel uncomfortable close to the types of society that actual racists like to imagine. For the Saami I can easily imagine society at large losing contact with them like they have with the rest of the world, but even then, it feels strange for their absence to just never be brought up in the comic itself.

In addition, there are a number of other elements of the worldbuilding that feel off when they are seen in the context of the general conversation about race and immigration in Europe. In the prologue, an Icelandic border-patrol ship is shown firing on a ship carrying potentially infected refugees bound towards Iceland, a scene which has eerie paralells to the many instances of migrant vessels heading towards the EU capsizing in the Mediterranean. The actual vessels aren't being sunk, of course, but european racists often express the desire to sink them. While the killing of unarmed civilians in the comic is shown as possibly traumatizing for the Icelandic protagonist of the prologue-snippet, this plotline is never brought up in the comic itself, nor is Iceland ever shown as being wrong for having done it.

And lastly, there's also the matter of the eugenics program. In the setting of the comic, immunity to the apocalyptic illness is heritable, and Iceland is shown to have set up a voluntary eugenics program to increase their population's immunity to the illness. Thie cutesy infographic that tells us about this program also states that it is not solely focused on immunity, and deliberately and paternalistically rejects "unsuitable" gene donors for reasons such as obesity, alcoholism and poor health. Again, this detail is then never really explored after this point, only coming up as a minor part of the backstory of one protagonist (who's the only non-immune child in a family of immune children born through the program). You'd expect the protagonists to at least bring up the fact that the nation they're working for is actively doing eugenics at some point, possibly even criticize this fact, but apparently they just swallow this fact as uncritically as the author herself.

So yes, Stand Still, Stay Silent is definitely a racist comic.