correct.

In this video a "5/8 wave" FM band antenna can be clearly seen at 22 seconds, to the right of the chimney (which itself had a pirate FM antenna at the top for another station several years ago before used for mobile phone operators):


https://www.rte.ie/bosco/components/player/iframe.html?clipid=22611148&autostart=false&app=true


The 5/8 wave is not the only FM antenna, what looks like a higher "dominator" FM antenna is seen in other fire footage online of this old factory as well as a low folded dipole. Which one they were actually using recently I do not know. Maybe the "dominator" gave trouble and they used the 5/8 wave instead? just speculating, as the 5/8 wave is apparently not there very long.

This now burnt out complex was also home to a shortlived pirate DAB transmission some years ago

the "dominator" on a tall mast, can be seen, if look closely on the drone footage video (on the right hand side of the picture, around 10 seconds in) available on this page, :

https://www.rte.ie/news/regional/2026/0513/1573067-waterford-fire/