Did they really have to make those random members of parliament be all rapey with that comment on the two girls? Then again... there are human politicians in real life who do tend to be like that, in many countries.
Isekai Ebola, wow. Sumire's time power should be limited regarding its scale (as we saw its limited area of effect), but I still think she could use it to "cure" at least maybe a handful of people. They don't reveal that kind of power without the intention to actually use it later or it's bad writing; I think her power is Chekhov's Gun that's prepped and ready to fire later in this arc.
There is a chance that Seed Eight's "antidote" is a fakeout intended to lure them into a trap, in which case it's probably going to be Sumire's power that will save the day. After all, would he be that stupid to actually create an antidote for a disease they can't catch...?