The deal was that before Nokia Qt was GPL or commercial but after Nokia bought it they relicensed the open-source offering to LGPL. This obviously reduced the demand for the commercial version but there's still plenty of companies who would buy it for both license and support.

The commercial business/licensing was sold off to Digia, which eventually bought the whole Qt division.

Yes, I understand this, but Digia went back to GPL and back to selling GPL exceptions like Trolltech did originally?

Digia is doing the same thing Nokia did, which was the same thing Trolltech did. The only difference is that, since the Nokia takeover, the open source version is also available under LGPL. This has not changed under Digia.

They never stopped selling commercial licenses, so there's nothing to go back to. The only thing that changed with Nokia is that they made it also available with an LGPL license.

No. it's still available under the LGPL.