Watched this for the challenge as well, but I'd completely disagree. There's a helluva lot more going on in Blood Quantum than just a zombie movie. It just uses the the genre as a device to talk about many many things about histories and struggles of First Nations peoples and Blood Quantum speaks to everything from colonization by settlers, stolen land, inter-generational trauma, Indigenous blood percentage, First Nations customs, fighting between Nations, etc. As a Canadian we're a little more aware of these issues, which Blood Quantum weaves in masterfully. The shift you're talking about with the climax is very personal to the truths and customs of First Nations peoples, and the movie doesn't force feed the audience to any of these small details and is an Indigenous horror film made for Indigenous audiences telling Indigenous stories, so if you're not versed in First Nations histories/customs a lot may be lost on those viewers, but that's why it also functions as a zombie flick which it's also incredibly fun at being. I loved it!