>>45358997To play devil's advocate, there is little to no reason for idols (as in, actual idols) to sing live in their concerts instead of lip-syncing their ways through either (especially since they have to dance too which can be exhausting af), but some performances are still live (while most others are indeed lip-sync'd)
It can simply be that the performers or the management want certain segment to be live to be more authentic. It's not like fucking up a song or two will ruin the live anyway.
IRyS was freaking out at 4:00AM JST too (
https://twitter.com/irys_en/status/1637168682593058816). If they were just trying to keep the illusion up, she must be quite devoted to do it that late.
As others said, most of the performances are likely pre-recorded, but some segments (i.e: MC, perhaps certain performances) might be live
