I agree with them on several points, the obvious ones like RAM and processor are obvious, I didn't know people were praising the OP3 for audio, so that's a new thing to think about.
The screens are meh difference. Moto used better screen tech but OP3 colors we know are just between the G5 and 6P on accuracy with the sRGB update and we don't know how accurate the Moto G4 Plus is yet. The camera I disagree on.
The OP3 camera falls behind the 6P while the Moto G4 Plus was rated equal to it by DXOMark. The examples they used in the video seem to indicate the G4 Plus is better than the OP3 on the camera front, but... they've probably used both phones far more than I have, so I may just have to defer on that point.
The not using the FPS as a home button thing is sorta a good point, but for the wrong reasons and it's something that OP3 does wrong too. The real reason is, "Daniel-san, must talk. Walk on road, hm? Walk left side, safe. Walk right side, safe. Walk middle, sooner or later, [makes squish gesture] get squish just like grape. Here, karate, same thing. Either you karate do "yes" or karate do "no." You karate do "guess so," [makes squish gesture], just like grape. Understand?" - Not because a FPS should be a home button.
Overall I'd say the OP3 is definitely worth the extra $100.