The last thing you want the fire services to do while the passengers are still on board is to open the aircraft hold as soon as you land.
What you would prefer to happen is for the fire services to assess the temperature of the hold by scanners.
If the hold temp indicates a fire then you may choose to evacuate the passengers first, before the hold is opened for firefighting (don't want to add oxygen to the hold with pax still on board).
If the hold temp suggests no fire, then proceding to the gate for normal disembarkation if prob a good call to avoid unnecessary injuries. Then after disembarkation you can open the hold and investigate further.
This may be the case here with the well-trained Irish firefighters.