Sure.There are a few caveats here:
-Cinebench is a very specific workstation load. While it's an okay general predictor of overall performance, it's a poor predictor of some things (like gaming performance).
-Ryzen traditionally does well in Cinebench compared to Intel.
-Clock scaling is not necessarily linear.
-We don't know all-core turbo speeds of these new Ryzen chips. Though I'm hoping they're as high as it looks even with "normal" cooling. Nor do we know the power limits/cooling/BIOS settings of the demoed Intel chips, which can affect performance quite a lot.
Still, even if we give Ryzen a 10% advantage over Intel in Cinebench performance when compared to other tests, matching the 9900K at lower clocks is very impressive. It's hard to see how this would fail to come very, very close to it across the board.
Some software are specifically optimized / poorly optimized for certain CPU type.
We all know Ryzen processors do well in Cinebench in multi threaded workload.
However matching Intel CPU in Cinebench in Single threaded test is something past generation Ryzen processors never achieved.
Of course, assuming these numbers on today's ppt are real.