Yes, anon, we know that. It could be lass than 30k individuals indicted. On the other hand, a sealed "court action' could be an indictemet and indictments could have many individuals named as indicted….and these are probably mostly indictments. 30K could mean up to a million people, even 2 million, but probably less than 300,000.
30K is a good number for a working hypothesis. Nothing we can do about it anyway.
The problem is that people want absolute certainty and can not hold 2 or more differing possibilities in their mind at the same time.
Schrodinger's Cat was easy by comparison.