That means that AMD will enjoy a better IPC than anything Intel for at least 1 year, until the end of 2021, when Intel will launch Alder Lake.
Intel Rocket Lake, expected in March 2021, cannot have an IPC better than Tiger Lake, so it will also have an IPC slower by at least 6% than Zen 3.
Because Zen 3 tops at 4.9 GHz, Rocket Lake will have to reach at least 5.3 ... 5.4 GHz to match or maybe exceed Zen 3.