>Anyone familiar with this?
Yes. If the redaction is done properly within Acrobat, the underlying information, and all file metadata, is wiped. If another method is used, you are just putting removal stickers over the data.
surprised twitter hasn't put politics down in category 9 or lower at this point
>doesn't it depend on if the pdf pages were images that were already redacted in hard copy, or whether they converted the electronic redacted document to pdf?
No.