Same thougth cross my mind lol. But honestly there's quite a few (if not more) leftist/anti-capitalist argument you can make against globalization as well, if that's indeed what you were referring to.
Overall I'd say its not really useful to plaster western political understanding on a japanese work.
Yeah, I guess, if globalization comes in the form of colonization (which historically it almost always does), then protesting that is pretty leftist. I guess I'd argue that it feels pretty short sighted to attack globalization on those grounds, rather than colonialism itself.
Although, specifically because it's a Japanese work is one of the reasons it comes off as reactionary conservatism: the history of Japanese colonialism isn't really taught in Japan or discussed amongst the general populace to my knowledge, and Japan has a long (and continued) history of national isolationism and ethnic policy making (look into the discrimination of the Ainu for example).
Anyways, you make some good points, but considering the political climate in Japan, and the fact that this comment is the only political statement really made in the manga as far as I can recall (lack of other context), I don't think the connection is unwarranted. Still, if it can be safely ignored, or reinterpreted into something else, I think it's fine to do so, until more political messaging providing more context comes along, at least.