As the article says "Not that FP32 performance is the end-all and be-all metric " we won't know until it comes out for sure on its performance. Point being that the 2080 Ti delivers 14.2 TFLOPS vs the 3070's 20.31 TFLOPS yet based on UserBenchmark data the 2080 Ti eeks out a 4% real world performance lead in games over the 3070 and a 14% lead in synthetic benchmarks. (not counting raytracing)
While I would generally agree, that's mostly just the case across different generations of architectures, where the amount of potential compute performance could mean wildly different things for actual gaming performance. Within a generation of hardware though, the TFlops should usually be a lot more meaningful, especially since these are using the same chips as certain desktop parts, just at significantly lower clocks. If that "up to 15.3 TFlops" number pans out, that would make it slower that a "16+ Tflop" 3060 Ti, and due to the limitations of laptop cooling, many notebooks utilizing it might not even manage that.
And that kind of performance makes sense. Based on the specs rumored here, the "3080 Max-Q" will be utilizing the same graphics chip and memory configuration as a 3070, but with a little over 4% more cores enabled. However, its nearly 30% lower boost clocks (and 50% lower base clocks), combined with almost 15% lower memory clocks means it won't be coming close to a 3070. At best, it will probably be close to 25% slower than a 3070 in games limited by graphics performance, and slightly slower than a 3060 Ti, assuming it can even reliably maintain those boost clocks for extended periods.