If you're FNC, and you've had a month to prep pearl, and you feel comfortable playing it (at least from scrims, which for an experienced team isn't just 'useless' experience), and you're playing EG - would you rather ban fracture, their best map, and play pearl, a map you've spent a month prepping - or ban pearl and play a team on their best map (and probably the best team at that map itw rn) just to keep your prep hidden?
It just doesn't make sense for them to have not prepped it. They can ban it in matches where they think they can have the upper hand in vetos without it, but I guarantee they'll float it against teams where they feel the need to ban another unfavourable matchup. They will almost certainly be holding on to their pearl strats for as long as possible to minimise antistratting potential, and honestly probably weren't really expecting to have to pull it out somewhere in the lower bracket run.