Can confirm that the 202307 production date seems to be no good - I just got mine new from Sweetwater with that date code and it definitely has the hiss (it's somehow a lot worse than I imagined - I kinda hoped I'd be able to put up with it but yikes, it is not subtle).
It seems like, at least for me, it's sadly not worth bothering with the FR-10 until the market collectively runs out of old stock. (As much as I love the idea of swapping the board out for the V2, I'm just a lowly guitarist with 0 electrician chops.)