No it wasn't it predicted xx switch version and MHX. That's not the easiest combination of games to predict regardless of how you look at it.
It predicted a game called XX (true) and MH5 on PS4/PC/XB but not on Switch (true). Not an easy prediction to make in either case, let alone combined, since nobody had any idea what an X sequel would be called, and MH5 on PS4 sounded insane at the time since it's a franchise that only sells well in Japan on portables, and PS4 has sold relatively poorly in Japan.
The only things 'wrong' were QTEs in the game, a confused but easily reconciled narrative (Sony were desperate for Japan but wanted a westernised game, reconcilable by seeing it as a compromise between the two sensibilities) and the rest is still future stuff (MH5P for Switch) and unverifiable political conjecture (Sony paying for it not to be on Switch, and Capcom panicking internally).
If we omit the wrong claims of westernized and casualized gameplay, the missing weapons from previous games, the claims of QTE filled garbage, the fact that it didn't even get the name of the game right, and the ludicrous claim of Sony paying for the game to not release exclusively on Switch while it releases on every other platform, on a game that started development long before the Switch existed even as a concept, sure, it was right.
Why are you asking this question in a Japanese sales thread?
Because in a Japanese sales thread we get sales of non-japanese games. In the same way, we discuss japanese games in western sales threads.
It might be rhetorical but I'm gonna answer it anyway. The reason Japanese support is used as a metric for Japan instead of total support is that because the growth in the market is driven by big Japanese franchises for the most part.
Within the last 10 years we've seen am expansion in the ability of Western titles to launch to solid numbers but it hasn't been the case an rule historically. Do I think Western support is good and relevant to this market? It's starting to be yes. Do I think that Westrrn games really matter in determining how well a system is going to do in Japan? Nope. Domestic games are king.
That's why the discussion os always focused on Japanese publishers and their plans. That doesn't mean we think selling 100k+ of the Witcher 3 or 200k+ of horizon or millions of minecraft is irrelevant
If you want to convince me or anyone that any random NIS bomba or KT low budget 5th port of the same game, to set some examples, are a bigger growing factor for the market than the big western games, I have a bridge to sell you.
If you want to argue what 3rd party games are important for a system to do well, you can exclude mosf of those lists and talk only about Square Enix, Bandai Namco and Monster Hunter, because we've already stablished in the last few months/years that Capcom is irrelevant for everything else they do.