I really don't know, that may be the case. But I've also seen reviews with images like the ones I had.
For example here we see the dogs' white fur with a redish tone on the S9 whereas it is white on the Pixel2:
https://hothardware.com/ContentImages/NewsItem/43874/content/big_ulta-low-light-dogs-gs9.jpg
vs
https://hothardware.com/ContentImages/NewsItem/43874/content/big_ulta-low-light-dogs-pixel-2-xl.jpg
And here we see how the S9 completely looses all of the details in the white of the fur, whereas they are maintained on the Pixel2:
https://hothardware.com/ContentImages/NewsItem/43874/content/big_yogi-not-lit-gs9.jpg
vs
https://hothardware.com/ContentImages/NewsItem/43874/content/big_yogi-not-lit-pixel-2-xl.jpg
Here on the GSM Arena review, it praises the S9, but to me the photos look worse, even though when zoomed in there is less noise. Here we see an example of a photo where the colours are completely washed out on the S9 due to overexposure, whereas on the iPhone X you can see better details of the walls and pipe at the top:
https://cdn.gsmarena.com/imgroot/reviews/18/iphone-x-vs-galaxy-s9-plus/camera2/gsmarena_212.jpg
vs
https://cdn.gsmarena.com/imgroot/reviews/18/iphone-x-vs-galaxy-s9-plus/camera2/gsmarena_112.jpg
I've also attached two screenshots from the Supersaf comparison. One shows the problem I mentioned with the dynamic range, where the Pixel gets the image right, but on the S9 the house behind him is just a big white blur of light (and the details of the brick on the ground are all washed out).
And on the other one in low light, where he says it's actually better when zoomed in at 100%, at full scale the details of the brickwork and roof seem all blurred on the S9 compared to the Pixel.
So I don't know. Admittedly, none of that is as bad as what I've experienced with my own camera, but the same problems are there...