I would pay zero attention to that video. The top comment is calling the channel a fraud and that they fake numbers and do not even have the laptops. The fact we are not seeing afterburner info on screen, is a dead give away.
And you nailed it with AMD is crushing it, and cooler operation observation, as that is the most important thing in a gaming laptop. I do not care what the specs are, The cooling solution and design will dictate OOB performance. And if it is not up to sustained gaming, the performance drops can be horrible. I see reviews where OOB, the 9750H performs roughly the same, and sometimes worse than the 8750H. Depending on brand, model, and included bloatware.
I have a 2018 Dell G7, i7 8750H, 16GB 2666 (2x8), GTX 1060 maxQ, and I use a 6 fan cooling pad and use an aggressive fan curve (laptop fans) with it, to keep the performance smooth. It is the fastest solution to the throttling issues for the G7s design. As it has been almost strictly a vacation/holiday gamer, and used so seldom, I have not invested any time in throttle stop. To OP: those are all things to consider with gaming laptops, if you want to leverage the hardware to its best potential.
That GF65 has single channel ram so make certain to grab another stick if you buy it. Reviews for it are pretty good, and it will do better with 16GB dual channel.
Jarred is my go to for Laptop reviews, and it looks like the 9300H is the way to go. Unless you can find the 4000 series AMD spec the same within $100 that is.