Just as you read. Mafless LNF tuning is possble through Hptuners. I have mine running flawlessly and smoother than ever before with no maf.
Edit:
This is how I did it. Im sure there are a few different ways to do this and will be better ways in the future. It is alot like just scaling your maf.
First start by setting your whole maf correction table to 1s with the MAF plugged in. Also under torque managment/General/ETC limits/tq mgt inj disable set all to 0.
Do a long datalog. And look at your LTFT. If they are off either direction use the injector constant table to make a Global change.
Then Datalog again and repeat unitl LTFTs are fairly close to 0.
Next use the MAF frequency table to correct for the STFT variations. Shouldnt need much. But you wont be able to get it perfect.
UNPLUG THE MAF!
At this point you have taught the ECM about how much fuel it will require to run. I believe the MAF frequency is tied into rpms or MAP in some form in a hidden table. Or just uses a predicted frequency. It also has control over torque a lot like the optimum spark tables. If you lower it too far you will see timing droops while making pulls. This table is now alot like a standard VE table.
After unplugging the MAF you will have no way to monitor MAF frequency. This is fine. Your MAF correction table now becomes a lot like a VE Multiplier table like when you do a OS upgrade on a LS based engine. So if you havnt already, make a AFR error PID to fit the maf correction table along with a ST+LT PID.
Datalog.... Datalog..... Datalog..... Copy paste special by % half the ST+LT trims into your Correction table. When It seems to be getting close you can fine tweak it further by adding the AFR error ontop of the fuel trim paste. Since we do not have loop control YOU HAVE TO DO A MULTIPLY BY% HALF WITH THE FUEL TRIMS FIRST THEN ADD THE AFR ERROR. The AFR error PID will give you the error that occured before the ecu was able to compensate then how much of the error was not compensated for after adding or subtracting fuel.
After your done be sure to enable DFCO again.
Hope this works for some of yall. This is the exact process I used. Now my trims are under 1.6+- at almost all times and the car runs smoother than ever before. You will get a CEL for disconnecting the MAF. Right now I have it set to MIL off after x cycles. Im going to play with disabling a few of the codes and see what happens.