From a raw teraflop-number this could be true, but the PS4 has an older feature-set and moves this number-comparison to the absurd realms.
T239 / Drake / Switch 2 seems to have:
- way better CPU than everything in Gen 8 had to offer
- not massive, but existing Raytracing
- more recent ways of programming the GPU (DX12-level, important for future engine support and making ports easier) and more recent optimizations, for example texture compression at higher average compression rates
- DLSS
- file decompression engine
- no slow hard drive
- even with 8GB of Ram the smaller Switch-OS would give developers more memory, I personally still dream of 16GB but think that 12GB is also very possible.
- Tensor-cores could also be used for AI in games
- hardware-decoding could make game files smaller, better hardware-enconding could save space and battery for features like saving the last 30 seconds of your gameplay
All these features will make the console more powerful than a PS4 Pro. Comparing the handheld-mode with the PS4 also is not a fitting comparison because the PS4 was made for 1080p, SwitchTwo-handheld-mode will be 720p.