People seeking high refresh rate gaming usually turn down visual quality settings to improve frametimes and overall responsiveness. Even once they reach the fps they are seeking. Not always, but this is common.
That video was on ultra settings which anyone seeking 144/240 for an fps is unlikely to be using.
I'm not saying the claim DG made is true. I have no idea.
If you want to check if it is possible then you would need to find someone running the game at low quality with the 1070.
ive posted my fps before on here with min max and avg fps benchmarked. my avg fps is 201 fps. in pubg. if people dont believe it come join discord play with those who have similar set ups running these kind of fps. quite a few of us off here play together. also those on amd chips just cant keep the high fps like we do.
i have ryzen rigs tried cards in them just cant do the same in pubg like the intel chips can. you need the high clocks. for the high fps.