The explanation for all of these "Generation Z is conservative!!!" takes is probably the racial and gender gap within the GenZ generation in the US. If you consider how brown GenZ is, the political views of a very white school is likely going to be atypical of the generation as a whole. People might be misinterpreting a certain amount of whitelash as representative of GenZers in general.
This. Furthermore, if millenials and Gen Z are roughly voting along the same lines, and Gen Z is less white than millenials, then it obviously follows that white Gen Z-ers are more conservative than white millenials. But of course that doesn't mean Gen Z as a whole is more conservative.