It's a comparative thing. The DAC on my DAB tuner (Sony STD777es)
sounds
inferior then when compared with the sound whilst connected through the
DAC
of the Arcam Black Box 500. I would assume that lesser DAB tuners would
also
benefit in this manner. Yes the bitrate of the transmission has a large
bearing on the sound, but then so does the DAC. When I buy a new
Freeview
box with digital output next month I should benefit from the superior
bitrates seemingly available via this platform with some broadcasts.

Yes better, but NICAM and FM still sound better.....

Not really relevant though. No UK radio transmissions employ NICAM (do they
elsewhere?) whilst the radio services offered via Freeview aren't available
on FM.

Now say 100 times:
"My dapper Dad's damn DAB DAC doesn't do DAT justice."

Didn't hear you saying it )