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It seems they had the recordings of all individual mics from that large 2020 concert. They probably needed them for post-production of the releases on DVD/Blu-Ray and on Spotify (audio only). It seems they just reused that good concert audio for this VRChat concert and just did motion capture later.
I lined up the files from the virtual concert with the 2020 concert and they match perfectly. Only differences are that the crowd has been silenced, some screams mentioning Makuhari (the venue) have been muted and some instrument sounds still ringing from the previous song have been removed.
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It's also interesting that the first half of the concert have "230620" in the filenames and the second half has "230726". I originally thought those might have been the dates of the recordings, but I now wonder if it's the date of the MC sections that had been recorded for this concert specifically.