The article doesn't refer to that incident, so far as I can see. It does mention Patty Hearst, who was kidnapped a year after the Stockholm bank robbery.

The term "Stockholm Syndrome" originates from a police consultant inventing a syndrome to diagnose a woman he had never met, in order to discredit her criticism of the largely incompetent police response to her and several other people being taken hostage by a bank robber.

https://www.independent.co.uk/news/world/americas/stockholm-...