New. Not cold war. This didn't exist before.
It was suspended for the last 15 years! Surely it was easier to leave it suspended and unsuspending it is a conscious choice.
The change this year was to make it applicable regardless of those conditions: “Outside the tension or defense case, §§ 3 [...]” shall apply.
"Tension" is defined by an imminent threat (e.g., invasion) and must be explicitly invoked by leadership. "Defense" is actual ongoing attack of territory, and must be explicitly invoked by the Bundestag.
I have used https://www.fr.de/politik/drastische-wehrpflicht-aenderung-m... to form my understanding. Can be read freely by prepending archive.is/newest/ to the URL.