This comes across as a selective writeup to arrive at the desired conclusion of all three manufacturers doing about equally well. At no point does the essay touch on Sony's entry in the handheld console market and subsequent exit. If you factored that in, you'd see a clear advantage for Nintendo going forward because they have the sole control over an entire sector in the console business.
We are also in a year where Switch sales are poised to exceed the peak level of the Wii and will be only second to the DS. At the same time most people already expect the PS5 to do worse than the PS4, simply because Microsoft didn't commit tremendous blunders with their new Xbox. The very likely result is that Nintendo will finish this gen far ahead of both Sony and Microsoft in terms of both unit sales and profits. Japan being a lost cause for both Sony and Microsoft doesn't point to any kind of balance either.
Switch also marks the seventh consecutive generation for Nintendo. Just saying.