It was clearly discussed before he signed.
Biden to yank Keystone XL permit on first day of presidency
https://www.politico.com/news/2021/01/17/biden-yank-keystone-pipeline-permit-46014201/17/2021
President-elect Joe Biden will rescind the cross-border permit for TC Energy's Keystone XL pipeline on his first day in office, three sources confirm to POLITICO.
The move is billed as one of Biden’s Day One climate change actions, according to a presentation circulating among Washington trade groups and lobbyists, a portion of which was seen by POLITICO. The decision was not included in incoming chief of staff Ron Klain’s Saturday memo outlining Biden’s planned executive actions during the first days of his presidency....