But they were still working on Diesel 3 weeks ago according to an article they published: https://www.daimler.com/innovation/diesel/facts/
Winding down? They didn't just wind it down, they ended it and VW-Audi is years ahead of them because of the scandal that forced them into it and Tesla is many years ahead of that because they didn't cave to the fossil fuel smear campaigns and sabotage, but just kept moving forward... Meanwhile Toyota is doing their very best at trying to be the most sturdy stick in the mud. Though their partnership with their partially owned subsidiary Subaru to develop new all electric drive trains makes their stick in the mud shorter and shorter as time goes by.
They are but the current developments will be the last. But, I never trust car manufacturers when they tell that they are going to stop with something. I remember Volvo telling everyone that they would not be bringing out a new XC-90 after the first gen. A lot can change in a few years time.
VW and others are too, but it isn't cold turkey. They'll finish developing what they are working on now. Volkswagen says last generation of combustion engines to be launched in 2026 - Reuters New engine development at German makers to end by 2025, says supplier