Central Dublin is also the main rental area for IT/financial services, most of whom were told to work from home and many of whom left their rentals. The Daft Q1 report recorded this increase in availability and outlined that though there was certainly some movement from short let to long let, that particular movement had little baring on the rental market when compared to other reasons.
Students don’t look for rentals mid March, but when Colleges close for the academic year, they leave and go home, now they are not looking for rentals because it is unlikely that colleges will be going back to physical attendance until the new year at the earliest.
Again re: students - so how exactly would that effect the supply of rentals in Dublin central between March 1st and March 21st? Which is when the increase in availability in question happened. Students weren't moving out of apartments in that time period.