I saw this a while back. In today's world, when a person in his particular business has severe cognitive dissonance, he shoots a video and posts it on his YouTube channel. Make no mistake, he has a huge mostly-Canon fan following to whom he sells instructional materials. If a person wants to sell instructional materials to hobby shooters, that person definitely wants to aim for the Canon low- and mid-level camera crowd, just based on sheer, total numbers.
After he and his wife released the video of their head-to-head Canon 5D-III vs Nikon D810 test, where he proclaimed the D810 the best d-slr ever made, I imagine the push-back from his Canon using followers was positively huge--and this back-pedaling video was made not long after his "switch announcement" rocked the mindset of his Canon-using followers.
If you've seen his videos on YouTube, you can look at the comments from his followers; controversy follows him. Controversy generates hits. Hits generate sales of the products he sells during the videos.
Click-bait videos make money for people who sell stuff.