To answer your caption question: a pre-indictment plea offer is for purposes of you getting a reduced sentencing recommendation from the State, in exchange for you agreeing to plead guilty to at least one of the charges. From your facts, there is no mention of a lawyer giving you advice. This is NOT a circumstance where you can do-it-yourself. There are potential defensive issues you raise in your facts that if properly supported, could either be a defense or constitute a strong argument for a very reduced disposition such as PTI (Pretrial Intervention). If you do have a lawyer, discuss these issues before the Court date, if you do not, immediately consult with an experienced criminal defense lawyer admitted to practice law in NM. Do this before you make any decisions about this case. Good luck.
I do not practice law in your State. This answer is provided solely for informational purposes only. This answer does not constitute legal advice, create an attorney-client relationship, or constitute attorney advertising.
They want you to plead guilty without their having to do any work and without your knowing the evidence against you. This is a BS DA tactic to intimidate people into pleading guilty. Get a lawyer whowill tel them to stuff it if he's any good. If he recommends taking the offer keep looking.