I know nothing about this company and some of the results - particularly the high votes for the Greens and the decaying husk officially referred to as the Irish Labour Party - I am extremely skeptical about. It doesn't help that almost all the "broadsheet" newspapers are by this stage fluffers for FG.
And any reason why support for the SD's should have almost halved?
They seem to be weighing by recall of past vote which might explain that people might forget or be unwilling to admit that they voted for the Greens or Labour, thereby inflating their vote now, and might have an opposite effect for the SocDems, but as I said, there's no past form for this pollster other than the fact that its leading figures seem to have come from RedC (which I don't rate especially highly).