That doesn't mean anything. What matters is the type of LCD (or OLED) panel used.
All TVs that support DV have 12 bit pathways. I think some high-end Sony TVs are even 14 bit in that respect. I have one that supports DV, but the panel is 8bit + dithering, which helps a bit with banding, but it's still a 8bit+ TV. As long as the panel itself is limited to 10 bits, all that is pretty negligible.
I'm not saying your wrong, but as long as the manufacture's don't advertise the actual bit size of the display, but only the supported bit size I'ts hard to tell, but I found some reports on several test done an newer high-brand TV's and It stated several of them actually were 10 and 12 bit displays. Unfortunately I can find the source But if I do, I'll post them