Second off, you are saying that the next gen AMD flagship will barely be 20% faster than the 9070XT, which is ridiculous since the 9070XT was not even a flagship.
AMD canceled the HALO product of RDNA4 because of CoWoS allocation at TSMC, however things have changed and allocation is available. AMD will release a UDNA flagship for sure, especially after seeing what Blackwell delivered.
By the same logic, you could expect AMD next gen flagship to be 50% faster than the current 9070XT, which would be a logical 25% over the 9070XT, with another 25% for gen uplift, which is really conservative.