Sounds bogus to me. It is not really any more a power conditioner than any good power supply is. In essence every power supply has a power conditioning role as part of its function.
This unit though is not so much a power conditioner as a power supply replacement for units that are designed to be connected to its low voltage DC outputs.
Either way there are two possibilities here: -
1). The high priced units that have the ability to be powered from these units have deliberately deigned substandard power supplies so that two units instead of 1 are required to increase profit.
2). The unit adds no benefit and is provided to persuade the non technical to outlay more cash than they need to and increase profits.
I don't see any other rational explanation and neither is edifying and calculated to bring the company into disrepute.
There is a downside to this, and that is increase risk of interference, and you can see the company acknowledge and are concerned about this possibility in the user manual.