Except that in the line under that one in LASORS it says that you can also undergo a flight test in the capacity of co-pilot in which case you log it as P2.
I did my IR before my CPL and had to log the flight test as P2. I can't remember exactly, and I'm struggling to find the reference in LASORS/JAR-FCL, but as I recall you need at least an ICAO PPL to undertake the IRT. I was doing my IRT using my NZ PPL but didn't have a 'Type Rating' in my NZ logbook for the aircraft on which the test was to be done. I therefore couldn't act as PIC for the aircraft.
When I later did my CPL, the LST for that resulted in an MEP, under which the (same) aircraft was covered, so I was able to log that as PIC time.
The long and the short of it - if you have already got your CPL then a successful IRT can be logged as PIC. If you're doing your IR before CPL, then you may need to look into it a bit more carefully.
Hope this hasn't muddied the waters too much.