Highly doubtful on all this, specifically because it characterizes Capcom, Nintendo, & Sony as if they are individuals, when they are giant corporations. I highly doubt you would get a bunch of 'panic' if the formula has indeed changed as drastically as this rumor suggests, as the gameplay formula would largely be detached from the series Nintendo fans have enjoyed on their portables. As for Sony wanting the game to be closer to launch till announce - every Capcom game in last 2 years or so has been announced within 12 or < of its release, so this doesn't sound like its a move made by Sony, rather its a publishing choice being made by Capcom.
And if the game is headed to other platforms like PC & Xbox, then it puts all the 'speculative' part of this leak into even larger question, because why would this strain the relationship between Capcom & Sony, as well as bringing up the question as to why would Sony be paying for an Xbox game to be made, when its clear from the gameplay changes being made that this is supposedly being made for a larger, western-oriented audience. If this is missing Switch, I think its more a technical limitation from Capcom chasing the X1/PS4 specs more than anything. Its amazing that Sony would pay to specifically keep a game as big as MH off switch, when a MH game is being made for Switch regardless, when Sony did not do this with DQ11, another game in a similar situation to this supposed MH follow-up.
The characterization of this leak as Sony bullying Nintendo, Capcom being confused/desperate, & Nintendo being a 'victim', just screams of a Nintendo fan who is trying to rationalize the rumors that another main-entry MH game is coming & missing the Switch. Why would Sony want to save consoles in JP with MH, a game that has been viewed as a portable Nintendo title for the better part of a decade. Not just that, Sony isn't really hard pressed to save consoles in JP - it has the best selling console on the market WW, and it has cultivated a wide audience that is allowing JP devs to find success with their releases in foreign markets, which is something most recently observed with the release of Nier: Automata & Persona 5, among others.