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I see, I missed it because it's under the heading of Promotion rather than grouped with the description of the (unpromoted) Princess' move. I'd recommend grouping it with the latter; seems to me people are likelier to find it there

‘Mandatory promotion’ simply means deferring promotion isn't allowed, correct?

Have you tested with the (lack of) pawn‐drop‐checkmate rule? Seems to me there'd be a reason (i.e. pawn‐drop checkmates being distastefully frequent) for that to be in Shōgi, and whilst I may be wrong it doesn't look like this game differs so much that that reason would become invalid