I have the Tamron 150-600 and the 300mm f/4 and here is my real world experience and thoughts. If I have good light, and can shoot my Tamron at f/7-11 then I use the Tamron. Between the quality of the lens and my editing tools/skills I can turn out spectacular images.
If I need to shoot at wide aperture, and or low light, then I go to my 300mm.
The Tamron does have more chromatic abberation, but it's quality and versatility outweighs the superior optics of my 300mm in many day-to-day situations.
I agree with everything said in the video, just swap out the Tamron for the Nikon.