I think you're misunderstanding things a bit, the "Date" wasn't the update that changed things, it was the one AFTER that, which was the second-to-last one, the "Kirito gets sick" part :O Until the date there was no real change for how Suguha's story was going, it was the same generic forced-NTR-that-isn't-really-NTR development that has been going for her since Part 1 and that I pretty much assumed was gonna be her entire thing. It was AFTER that when the whole thing of how she suddenly did that brutal change of taking advantage of Kirito while he was out of it, TWICE in a row in 2 days, and how she seemingly LIKED it rather than having the expected "disappointed for being so small" reaction that the usual NTR logic would go for. Then even acted slightly yandere that last night of that update by criticizing Asuna harshly for "neglecting her duty as Kirito's girlfriend", and afterward in FoG she even tried to get Hebishima killed by the Tree Boss while also fangirling over Kirito saving his sorry ass from it.
ALL of this seemed to be indicating a completely new and frankly welcome change for her character that I did NOT expect at all to see in this game, and a couple around here were also positively shocked by, of her seemingly not only reacting in a more "real" way to getting the dick she wanted over the 'bigger' one, but also that maybe she herself was gonna be the one that got rid of Hebishima rather than some outside interference (This was the January update if I recall right so Fujino liking a comment like that back then would make sense).
However, it seems this update got disliked so much for overly focusing not in Asuna getting NTR-ed by Inoda too many times that Fujino backpedaled big time and the next update not only didn't follow-up nor had any clarifications of the things Suguha did offscreen as expected, it suddenly went to speed up the Asuna/Inoda plot massively out of nowhere (At least compared to how he had been dealing with their plot the previous days), and seemingly completely reverted Suguha to Hebishima's slut while acting like the past 2 days hadn't happened at all, and now these previews of the next update suggest that that's gonna stay and how she's gonna go forward.
As mentioned, I originally never had any expectations for any development like this one for Suguha, I had accepted this was a "dumb NTR logic" game where every girl around Kirito was gonna end up hardcore corrupted and NTR-ed unnecessarily just to ensure nothing good remained in the MC life at the end because that was Fujino's style, I had made peace with that since back in Part 1...hence why that development of hers had pleasantly surprised me. So to see it completely thrown away and discarded like unnecessary trash just because Fujino had to speed-up the main plot to please the fans and it's much easier/faster to write her as Hebishima basic bitch than the new development she was getting was hella depressing.
I don't really blame Fujino for it because a lot of this has been sadly outside his control, I just personally wish that if he was gonna do this then he never should have tried to do so in the first place because now that part of the game is just disappointing meaningless bait for the few people who cared about it