They probably have backups of this data, else they wouldn't negociate like that.
I was curious to check out Lockbit’s dumps when they released Boeing’s ransomware files but it was painfully slow to download and turned out to be a bunch of uninteresting files from random HR and IT software and their databases.
I think it's just them being petty about something and memeing, but if not then we will know in ~30 hours.