"Combat System", not "Armament". The armament is installed, the press release includes two images of the ship as "proof" of that. The main gun seems to have a blue-painted "trainer barrel" installed btw.
To me that sounds like the server racks possibly aren't filled yet. Either that, or they are filled but the software hasn't been installed as it's not needed at this stage.
After installation of the combat system they'll have another six-week phase for testing that. And after that phase the ship will be delivered. Which - stated in another part of the press release - occurs five months for now, thus leaving 3 months for the above installation.
I simply find that 'strange', having worked on / with Naval vessels for the last 25 years. The Combat System is simply the processing end of a computer that often takes feeds of information from individual / stand-alone equipment's (Gyro compass /multiple radar feeds/ Electronic warfare / Electro-optical systems / sonar & Comms, to name the obvious ones) & then distributes & displays the data onto multiple computer display monitors, located on desks with controls & switches to operate / fire weapons, etc..
Knowing for instance the 76mm SR Gun has a fire control station & a couple of data processing racks, along with hydraulics & cooling, meaning that it has to be systematically installed as the ship is being built (usually as some of the racks can only be put in when the ship is still be welded together, as they are too big to be transported thru a completed hull / compartment door frames). Missile control & firing systems may well fill a compartment with 3 - 6, 6ft tall, 2 feet square "19-inch racks", but again, that's stand-alone, these systems need input data from the gyro's, from Radar's, etc & that means cabling that has to be installed as the ship is built.
I can see you point / comment about processing racks being populated with blade servers / individual component shelves, but normally the equipment is tested (as standalone system), then connected to the Combat system, to ensure that the individual system has been 'set-to-work' , to prove the quality of operation / outputs are present / that it does as it should & that there's no cross connections / interference from other systems / errors in cabling / wiring / liquid cooling services / electrical power, etc.
All of this takes time, even on OPV / corvette sized ships & 5 months for total installation & testing is a big ask / too short a time, IMHO.
SA