The last time Intel released transistor count was for the i9-7980XE. It's a physically larger 18 core chip on the same process node as the 10 core 10900K tested, and googling says it had 9 billion transistors. If we assume that their improvements on 14nm let them fit all the same chips as the larger CPU into the newer one, then.... the i9 transistor count doesn't make a meaningful difference to the comparison.