"Wouldn't that only put the gaming performance on par with 5800X3D?" is kind of a silly question, really. The 5800X3D has lower single-threaded (and multithreaded) performance than a 5800X, yet smokes it in games. Obviously that's not a very good measure of gaming performance.
In this interview Robert Hallock also said that with Zen 3 Cinebench only went up 8-10% in IPC, but the average IPC increase over a larger number of software packages was 19-20%.
All in all, we can't conclude much from this figure.