Pretty much.
FCA was one of the last car manufactures holding out for lax EPA fuel economy numbers IIRC.
Ford and others were still striving to meet future stricter demands even when Trump was still in office. Fed mandates and the Cali nazi board.
FCA was buying emission credits from Tesla. Now that they merged with a new company, they have no need for Tesla's emission credits.
As far as Ford is concerned, they are pushing for stricter measures because they have a competitive advantage and can meet it while their competition can't. So of course they would be in favour of it.