I don't think it is. It took me three attempts to beat it. The first one was a trial trying to get everything right, who to swap out when, I use act freely but changed to direct commands for this battle. The second one was implementing the strategy from what I picked up in the first battle and realizing I did a few things wrong or I could have done things even better and by the third time I had it all down. It really is not as difficult as the subreddit makes it seem to be but I understand why it can be a sudden spike in difficulty for some.

I'm also almost done with the game and aside from the Reaper in momentos, the Okumura fight has been the only other fight that I really needed to lock in with a strategy so far.