didn't Rumble allegedly threaten to murder a federal agent?
Getting raided clearly makes some people angry enough to say foolish things.
Everyone should keep a calm cool demeanor and certainly not imply anything that could be taken as threatening.
And allegedly entered false statements concerning the identity of a transferee
That is what sounded like straw purchases. If someone, say a girlfriend of a criminal, makes a straw purchase, then when asked if they assisted in providing in illegally providing a firearm they say no, then clearly someone is lying.
Someone so inclined (such as an investigator) can say it is the FFL doing the lying, and they wrote the girlfriend's name when she didn't buy it or that he should have known it was the boyfriend that was actually buying it and the girlfriend just pretending to.
That is falsifying records to enable a straw purchase.
Straw purchases likely happen at some points at most FFLs, so the only thing necessary to make the ATF inclined to claim they were intentional and prosecute for them is an investigation and desire to prosecute them for something else as well.
A lot of these federal prosecutors have a habit of stacking many charges together, including some they know are exaggerations but add to the criminal perception of the individual, in order to encourage conviction on a portion of the charges by the jury.
It increases the perception of guilt or wrongdoing of the accused without a need for much in the way of evidence. It then allows the jury to feel like they 'compromised' when they only find them guilty of the ones the prosecutor actually wanted all along and did provide more of a case for, and as a bonus sometimes the jury even convicts on those exaggerations too.
It is a game.