It's not vacuum, It goes by pressure.
It's a single sensor with 2 lines. Let's say pre dpf is 3 psi and the post dpf is 1psi. The sensor would report 2psi differential pressure.
I read that thread a while back so I don't remember details.

In ista/Rheingold, there's a dpf service that gives you tests to run to check the dpf at idle, 2k, and higher rpm.
They have good values in mbar, like 80 mbar at idle and higher at 2k etc.
1000mbar is 1bar or 14.5 psi. 100mbar is 1.45 psi.
Try a small hole in the pre dpf hose to get it where you're close to what the test wants.
A clogged dpf would have high pressure pre dpf making a high differential.


Once you get that ok with your added hole, hopefully the dde will be ok thinking the dpf is not clogged.
set Rheingold to request a regen.
Drive gently, watching egt pre dpf... Probably best to do it at a time when traffic is low.
If all goes well after a while the regen will finish. Try another regen request, do it again.

After that maybe let engine cool to be able to safely remove the hose with the hole and see if the issue still happens. If not, maybe do another regen and a normal drive.