Heartland is digging themselves deeper but you skipped over an important point: Heartland’s twerpishness aside, there are a lot of commentators who agree that the memo they reference is, in fact, a fake mixed in with the real documents. The date is different, large sections are cut and pasted from other documents, the PDF has different meta-information, etc. But this has been treated with a thousandth of the (justifiable) skepticism applied to the Climategate e-mails or the Wiener pictures. And it’s by far the most damning part of the leak.