Normally, I would agree with this comment. I also don't doubt that Neku and Beat are different from their TWEWY selves. However, you have to remember that Joshua has the ability to move between universes, so it wouldn't suprise me if KH!Joshua turns out to be TWEWY!Joshua. At the very least, I suspect that even if KH Joshua is different, he might at least still have that ability, and will thus know about and make references to the events of TWEWY. In fact, I woudln't be suprised if their ended up being two Joshuas for that very same reason.