I'm pretty sure Intel has had multiple architectures essentially done for years. They simply didn't have the process nodes ready to deliver, or more accurately the executives prior to Gelsinger were not ready to spend the capital to move to improved nodes. This is why they've been able to push out 3 new chips with 3 different architectures in two years - Gen 10 (Skylake +++), Gen 11 desktop (Ice Lake on 14nm), Tiger Lake (Ice Lake + with Xe iGPU), and Gen 12 (Alder Lake).
As example, Jim Keller left Intel in 2020 and his main contributions appear to be to Arrow Lake (15th gen) and Lunar Lake (16th Gen). So we won't even see 15th gen until 2024, 4 years after he left, two years from now. These are the two, it is speculated (worse than rumor), may double Intel's IPC.
If that happens, admittedly a big if, we may be seeing a rehash of Intel 2008-2011 when Intel went from Core, to Core 2, to Nehalem, to Sandy Bridge. AMD was competitive with Athlon II vs Core 2 and Phenom vs Nehalem, but AMD lost it when Sandy Bridge came out vs AMD FX. Intel also lost money in 2009. The parallel is there, but the last half of the story has yet to be written.