You should not be paying sales tax again when buying your car out. They may be talking about PPT that you will owe to Acura because [I guess] they pay your county and then bill you.
Should I ignore the dealer and just pay it off online?
I am afraid there might be some sales tax I owe at the time of transferring the title. Is this paperwork generally straightforward or do I need to do some tricks to avoid paying taxes incorrectly
That I can’t tell you. Contact AFS and ask. They probably will estimate your PPT, so you may be overpaying. See if they postpone your payment until they get the actual bill from the county. The dealer has nothing to do with this, you are buying from AFS.
Update: Got the paperwork done with the DMV for $15.
The sales person at the dealership repeatedly kept saying I don’t have to pay sales tax only if I go through the dealership with a dealership fee of $800.(900 vs 800 tradeoff for me) The person who does less talking and more signing papers mentioned I was not required to pay taxes any way (0 vs 800 tradeoff) just like Ursus here.