From your first link: "While SARS-CoV-1 probably persists as a potential zoonotic threat in its original animal reservoir, human-to-human transmission of this virus may be considered eradicated because no human case has been documented since four minor, brief, subsequent outbreaks in 2004."

This is the same effect in play for SARS-CoV-2. It also persists in animals. It's a matter of time and chance before it reemerges.