It's more like 45% uplift over the 6900XT (its true prior-generation equivalent), and even 36% more than the previous-gen's 6950XT refresh is conderably better than average for a generational uplift.
Err, nope.
GTX 280
+57% performance improvement GTX 480
+52% performance improvement GTX 680
+54% performance improvement GTX 780 Ti
+28% performance improvement GTX 980 Ti
+67% performance improvement GTX 1080 Ti
+31% performance improvement RTX 2080 Ti
+78% performance improvement RTX 3090 Ti
+45% performance improvement RTX 4090
The mean value of these is higher than the number 36% which you consider "higher than average". No, it is not.
AMD's generational improvements are (much) lower:
Radeon HD 4870 (RV770) | 55 nm | 2008 | 956 M tr
+70% performance Radeon HD 5870 (Cypress) | 40 nm | 2009 | 2154 M Tr
+19% performance Radeon HD 6970 (Cayman) | 40 nm | 2010 | 2640 M Tr
+44% performance Radeon HD 7970 (Tahiti) | 28 nm | 2011 | 4313 M Tr
+50% performance Radeon R9 290X (Hawaii) | 28 nm | 2013 | 6200 M Tr
+31% performance Radeon R9 Fury X (Fiji) | 28 nm | 2015 | 8900 M Tr
+32% performance Radeon RX Vega 64 (Vega 10) | 14 nm | 2017 | 12500 M Tr
+22% performance Radeon VII (Vega 20) | 7 nm | 2019 | 13230 M Tr
+95% performance Radeon RX 6900 XT (Navi 21) | 7 nm | 2020 | 26800 M Tr
+47% performance Radeon RX 7900 XTX (Navi 31) | 5 nm - 7+ (6) nm hybrid | 2022 | 57700 M Tr
You can't use streaming processors alone as a metric though.
You can use the number of transitors then. Navi 21 has 26.8 billion, Navi 31 has 115% more, 57.7 billion.
Performance difference is terrible ~36% higher.