As has been pointed out, this season filmed in November 2018. Almost 2 years before airing!! You are right, that in the old days, a summer filming would air in the fall, and a fall filming would air in the spring, never more than 3 months or so between filming and airing.
After the success of season 30 in early 2018, they greenlit 2 seasons to be filmed in 2018. 31 aired spring 2019 of course, and now here we are for 32.
This is just speculation, but I think it has to do with the CBS turnover in management. 2018 was when Les Moonves left CBS in his sexual harassment scandal. And CB