In the real world, a forensic audit is a type of audit used to uncover wrongdoing. Regular financial audits typically only check a statistical sample of transactions for validity. A forensic audit will go much deeper, checking a much higher percentage of transactions (sometimes, 100%), but because they're expensive, they're only done when there's a reason to do one.
Poots think that demanding a "full forensic audit" is a thing they can do. In particular, you may remember a poot scheme to tap the seekrit "Treasury Direct" accounts a few years back that spread wildly by Facebook. They basically used a US Treasury routing number and used their Social Security number as the bank account number to submit electronic check payments. A number of merchants would accept these as provisional payments, pending final clearing, including Amazon, car dealers and others. Unfortunately, so did utilities and mortgage companies.
Most notably, this is the scheme that Randy Bean and Heather Ann Tucci-Jarraf used to pirate a Ford pickup and a $500,000 motor home using the proceeds from Beane's purchase of $30 million in treasury bonds using this trick. Of course, as soon as the payments were rejected, the feds came after them in a big way, with the inevitable result we remember.
One thing the poots did to try to forestall collection actions was to demand a "full forensic audit" of their account, on the theory that this was a super-power magic phrase that would somehow show that they were in fact entitled to the imaginary cash. Companies quickly learned to reply to anything demanding a forensic audit with a nastygram pointing out that the all-encompassing Customer Agreement did not give them the right to demand any such thing. Unfortunately for the suckers caught up in this delusion, that often delayed the resolution of the collection claims for another month, and in quite a few cases, triggered foreclosures, car reposessions or closures of credit card accounts, wreaking misery on the fools who demanded "forensic audits" without knowing what they were.
Of course, since "forensic audits" are only relevant to accounting records, which are audited using very different procedures from election materials, the request is a no-op. It goes without saying that they're just trying to start an Arizona-like farce in Michigan.