Not trying to be obtuse, but why the obsession over tflops? We still have a lot of unknowns on the table, both for the PS5 and for the XsX.
RAM? Read/write speed of the fancy-shmancy SSDs? Dedicated audio / raytracing / etc hardware? CPU architecture and power?
I feel like we are salivating over the PR headline when the real-world console performance depends on several other (missing) factors.
Flip it around: if PS5 has dedicated ray-tracing hardware with twice the throughput as XsX, won't that offset the meaningfulness of the GPU tflops? In this presser, Microsoft mentions their "patented variable rate shading", which itself will allow devs to squeeze more out of those 12 tflops than they might normally be able to, and if Sony lacks something equivalent the PS5 could have 12+ tflops and still be lagging behind. If Sony's SSD is significantly faster than Microsoft's, that will drastically affect load speeds and pop-in, perhaps even compensating for a weaker CPU/GPU.