Btw, knowing Alpha Sin he's probably like "oh noes Nintendo is fucking going third party" and "Nintendo's doing what-the-fuck-ever without even consulting their fans". Typical Alpha Sin.
As someone who actually watched the video before casting judgement: No. No he doesn't.
At no point does he accuse Nintendo of "going third party". The only time "third party" is even mentioned is when he discusses Nintendo's current situation in the console market where other (third party) companies have largely abandoned the Nintendo platforms involving things like cross-platform game releases. What he does discuss about Nintendo going to multiple systems is a casual optimism about how Nintendo will have a larger market to reach with a veriety of new devices to take advantage of. Nothing about them going SEGA, though.
The video also focuses on Nintendo as a business, and not as a fan service platform. I don't know why this is so hard to understand, but not every news service has to delve deeply into what the fans want, or having the company consult what they want, expect, and demand from them. Whatever the case, the fans wern't even mentioned once during the video. It wasn't about the fans, as it was purely about Nintendo's business decisions, as well as some thoughts as to what could have inspired those decisions and what they could mean for the future of the business.
Way to make rash judgements on something you refuse to even see for yourself since it has the potential to be something you disagree with, though. Typical fanatic brand loyalty.