New setting, new directive
One thing that has already changed in the narrative of the redraws, besides the obvious Flash attacking Blast yet again (because he never learns) and the dialogue, is the setting.
The meeting place has been changed to occur in Sitch's office space instead of the place where the demonsterization experiments are taking place, so it remains to be seen if it's gonna be included at all.
It does make a lot more sense for Flashy, Saitama and Manako to adjourn at Sitch's public office instead of the demonsterization chambers however, because they are not privy to that information yet and haven't been invited to watch. They would not know where to go initially unless directly invited by Sitch.
Thus this was changed in the redraw to make more sense as a location for a meeting between all these characters to take place in and probably one of the reasons why we are getting more redraws in the first place. If anybody is a perfectionist, it's ONE and Murata-sensei.
Remains to be seen if demonsterization will still feature in the manga during this current arc or now, but it does seem pretty important information to be left out, so I would assume our crew might be making a slight detour into the basement before Void is introduced again. But who knows, chances are demonsterization portion might've gotten scrapped completely, which would be a very large change in the direction of the storyline.