Actually the Presto Poplite roasts coffee very well, and it most certainly does get hot enough, in fact IMO, it may get a little too hot which tends to roast the beans a little too quickly.
One of the reasons he may not be getting an even roast, (we sort of have to take his word for it, as he didn't show the roasted beans in a close up), is that he is not stirring the beans in the initial minute or so of the roasting process, (until the beans begin 'stirring' by themselves).
Even if one gets a s l i g h t color variation, that IMO, tends to add a nice flavor to the final product.
Also, it appears as if he didn't roast the beans long enough, again, its too hard to tell as I had to rely upon the sound of the crackling I heard.
Having written the above, let me add that I've been roasting coffee since the 70's, and I don't seem to get that perceivable of a color variation to the roast using any type of popcorn popper, and I've used many different types. (My favorite is a stove top stir type of popper).
Technique is key, and this video shows zero technique in using a popper type roaster.
He simply placed the beans into the popper, and walked away!