The "It's about American imperialism!" theory ascribers are left malding after this latest chapter. That Somali reference makes it clear who the aliens are meant to represent.
The author is aware that he's in the middle of the curve in this genre. The first chapter seems tailor-made for readers who have already consumed tens of other mangas with this exact same trope. No characterization, no background, no lore. Nothing at all. It's like he wants to get the beginning...
There's a view on the conservative right that dislikes the perceived trend of people saying "Happy Holidays" instead of "Merry Christmas", using BCE instead of BC or calling their wife/husband "partner".
Actually, the thing that truly sets the stage and confirms the nature of the manga is the protagonist complaining about the "partner" thing.
That's just way too niche within Twitter rightoid circles and RETVRN types.