It’s because the photos are of an existing Portal installation in Lublin, Poland and Vilnius, Lithuania. Lublin is my city and this thing has been running for a few years now. Everyone loves waving at it and seeing if anyone on the other side waves back. It’s quite silly but also rather touching.
Presumably because they are of a previous location of the art’s installation. The article is written in future tense, so it stands to reason that there are no (interesting) pictures of the new installation yet.
(I don't know Dublin well enough to tell if any of them are of the Dublin side.)