These editing keyboards are actually quite common on Ebay. I wouldn't recommend paying for one unless it's the Sony BKE topre keyboard.
some video editing keyboards (chyron) use cherry clear switches. Some (Pinnacle) use mx blacks. Some (sony BKE) use topre conductive dome. The BKE-9400A can use omron or topre capacitive. Omron switches also seem to be popular with other boards. Many of them (chyron, older chyron, lots of others) use keytronic.
The one in the ad appears to be a rubber dome. like many of the video editing keyboards made after the 1980's.