I don't want to be a downer or sound conspiratorial but that release date looks to me like:
1. They are trying to puff up their financials for the fiscal year (
ends March 31st) as the majority of sales will probably happen within that 1 month post-launch period as is standard for JRPGs
2. If this has the standard 6 month exclusivity window, they'll be able to announce the PC port around TGS 2024 which allows them to keep talking about the game later in the year.
2a. Bonus points if this positions them to have ports of the two FF7R installments ready to roll in the Switch launch period sometime in 2024