Neither of those are about network security, but are about the ability to collect data on individuals or to influence campaigns.
THe bans on university networks do not stop any of that, as this article points out.
Additionally, the app can still collect data on the university networks. It just has to wait to send it until they connect to a different network (eg. cellular)
If this was such a security concern, top-tier universities would be blocking it. Not 3rd and 4th tier universities with nothing to steal. If the Chinese government wanted data from a US university, they'd send someone over as a student to join the research labs it cared about.
Additionally, from the same article you linked about why your response and the bans themselves don't make sense:
TikTok is hardly the only company swallowing a lot of data on Americans, from car makers to smart doorbell firms. Consumers’ credit card purchases, contact lists and recent GPS locations are hawked by hundreds, if not thousands, of companies in the so-called data broker industry, Germain noted.
“If the Chinese government wanted it, they could just go out and buy it because it's for sale,” he said. “...I think people, when they're worried about TikTok doing something, they should ask themselves whether they should be worried about American companies doing the same thing.”