Personally I do not see that much how the MAF is affected on the pressure side.
I think the most important thing is the plumbing and having it in a straight piece of pipe.

In the first ECU's using MAF's the calculation for base IPW was just MAF/RPM*constant with no IAT correction and they worked just fine delivering accurate air fuel ratio.
The air is cooling the element, and depending on how much it is cooling it, the airmass is determined.

The reason the MAF needs no IAT correction, is that the IAT is already built in - hotter air is less dense, and also cools less. Same with pressure - denser air cools more.
I know HFM5 type of mass air meters are used on some diesel trucks in the inlet manifold, so it can work just fine there.

If the MAF did not take these things into account, the car would go massively lean on high altitudes and in hot weather conditions.
But this is not so. This would be only the case with an airflow meter (loaded spring/flap based), but we are using an airmass meter.

This platform is 20 years old... Enjoy your limp mode without traction control light

It doesn't matter

Will work on most if not all VAG ME7 binaries.

Search for TDMLMN location
xx xx 9D 04 09 81

Change 09 81 to CC 00

You can also just change the 9A to 8A instead of CC 00.

If you need more help then you shouldn't be doing this