It may not say it directly but the implication is clear, in that uncontrolled re-entry is dangerous to anything that might cross its path, including people, infrastructure, planes, and pigeons if they’re really unlucky.

That's not a sufficient argument. Something can be dangerous without being sufficiently dangerous to warrant any personal action. In this case, I believe if you calculate you will find the chance of an aircraft being damaged was so extremely slight that it wasn't worth delaying any flight.

I'm not sure why you keep harping on this. Their last 5B literally fell on top of an African village a few years ago[1]. While of course you're correct that we have calculated risk profiles and nothing will ever be "100% safe," China's 5B re-entry did not meet these standards. Spanish and Portugese authorities absolutely made the right call to partially close airspace as the rocket safely made a re-entry.

[1] https://www.theverge.com/2020/5/13/21256484/china-rocket-deb...