????? You are probably looking at the top 10 overclocked results. Easy trap. For the record the 10900K normally does between 1400-1500.
https://browser.geekbench.com/v5/cpu/search?utf8=✓&q=10900k
This does 1507. Also let’s not forget that this is an engineering sample, who knows how early one and with what other system specs (RAM frequency etc) it was tested. We don’t know the boost speed at which this single-core test was actually ran at (the information you read under processor information is data logged from the chip’s ID or motherboard, not what the software measures during the benchmark). Also being an engineering sample we don’t know architecturally how final it is in terms of critical path optimisations etc.
Regardless this shows one thing. That Intel is targeting 5GHz with Rocketlake and that there is a working 8-core/16-thread sku. Still no signs for a 10-core Rocketlake so apparently the rumours are true that the Rocketlake flagship is going to top at 8c/16t. Even then I expect the Rocketlake 8-core to beat the 10-core 10900K even in multithreaded workloads but in most such instances it will probably be a less than 5% victory.