In the manual for the Express for the mobile capability
it clearly states that it can communicate using the Powerlink module.
“PowerMaxExpress can also communicate using broadband/ADSL using a Powerlink module”
This HA integration pretends to be a powerlink module to interact with the panel and so your panel should be OK. Although I admit that this panel is not one of the common types and so it should work, according to the manual, and the connector looks like it’s correct.
For the pin connection, are you connecting it like this, notice that this diagram is upside down to your panel picture so what do you mean by 1st row 4th pin?
Hope all goes well
