Travel advisories are meant to inform travelers of risks... not provide commentary or political discussions on domestic policies.

When I worked at a huge company, I found that most advisories from state department quite accurately portrayed the risks in country. I would often look at state.gov and then talk to my local security people and they were close enough to be valuable to most travelers.

The politics behind this is likely to reduce people to people exchanges, primarily commercial ties. The other subtext is many PRC financial criminals (legitimate ones, not just dissidents) fled to US/west in the 90s and thought golden parachute western passport would protect them, only to find out US state department doesn't have the political leverage to challenge PRC exit VISAs if they ever get coerced to return to mainland for prosecution. This includes their western born kids who are guilty by association. This is basically state department telling these people we warned you / wiping their hands of responsibility if shit hits fan.