Black square vs redaction tool difference is well known if someone's job involves redacting PDF or just working with PDF. It's most likely that additional staffs were pulled in and weren't given enough training.
It seems insane that nobody at the other end runs something as simple as MAT or imagick (twice) over it to take the text layers out before uploading though. I hope this is at least partially intentional.
My understanding is that many people were fired and replaced by loyalists at the FBI. I think there are a lot of incompetent people working there right now.
Let people believe it's deliberate sabotage. Unfortunately, in real life, minions of a dictator serve the dictator; they don't risk their live or safety for a noble cause. Any screw-ups are a result of gross incompetence that is typical for every dictatorship.
Yeah — don't attribute to resistance what can adequately be explained by idiocy.
Colleagues whose full time job is doing this sort of thing for various bits of the government have told me this is exactly the case here. People from all over the government have been deputized to redact these documents with little or no prior training.