It's the A/C/E platform that has netting. It happens with the CBOT Dow futures also. They only print the largest trade during a 2 second time frame.
Here is another email I got from Tenfore confirming my guess. "EUREX is netting the data, that means max. 1 update every 2 seconds... It means that they are sending maximal 1 trade every 2 seconds. If there are more trades, they do not get transmitted." So, if you trade Eurex with IB, you don't miss any quotes because 1) IB snapshot quotes refreshes quicker than 2 sec and 2) if Eurex doesn't transmit every trades, IB can't get them too.