I agree it is a bit ambiguous but I would read,
"The world’s smallest (dual DVB-T/T2) half height card design enables this product to grace even the smallest and sleekest entertainment PC’s."
to mean two DVB-T/T2 tuners.
I believe my Hauppauge HVR-4000s and HVR-4400 have been advertised as having a DVB-S/S2 tuner but it is just one satellite tuner on the card capable of both DVB-S and DVB-S2. I guess you have to say both otherwise people would query if you could receive DVB-T with a DVB-T2 card (and it also sounds like you are offering more!)
Mew
"The world’s smallest (dual DVB-T/T2) half height card design enables this product to grace even the smallest and sleekest entertainment PC’s."
to mean two DVB-T/T2 tuners.
I believe my Hauppauge HVR-4000s and HVR-4400 have been advertised as having a DVB-S/S2 tuner but it is just one satellite tuner on the card capable of both DVB-S and DVB-S2. I guess you have to say both otherwise people would query if you could receive DVB-T with a DVB-T2 card (and it also sounds like you are offering more!)
Mew