'oh no' what at all not a surprise.
His ex-party leader, the relative, the judge and some other dude are all in cahoot on this.
The relative is the 'leader' giving out order (though the ex-party seem to plan his own backstabbing later)
On the surface the silver wing party handle thing.
In the background that other guy handle it.
And if anyone try to bring them to justice, the judge bastard is there to shut it down.
Some more stuffs happen and basically the MC had Vivia hid with wind magic while holding a magic tool to broadcast the sound.
Basically, right outside the room the villains are having their victory dinner, there's all the scholars/researchers we see at the start of this chapter (yes, turn out that huge line of people turns out to be Chekhov's Gun all along) having an open-air dinner, and they heard that confession loud and clear.
So those people are going to raise issues with this after losing all this historical books, which clearly isn't something the villains can jus shove under the rug given the combined influences of these guests.
Last RAW I see have the silver wing guy about to fight MC.