True this is bullshit. The government has a direct policy of wealth transfer from the population to itself and banks, who have "foreign" (except of course not really, for the worst example look at the board of the "gift to Ireland" national wealth fund and how the very young board members have no qualifications or experience and DO have family in government ...) ownership. Which, conveniently, isn't counted in the Gini coefficient.
But if you count household wealth in houses in Ireland, household wealth in Ireland in 1986 used to be 3 average Irish houses, and now it's 1/3rd. This was, just like anywhere else, deliberate government policy, amongst others to allow banks to invest in housing stock, preferential tax treatment and guarantees for property ownership, government buying of specific (mostly politician owned) housing, non-enforcement of both Irish and non-Irish tax law ... the list goes on.
Ireland prides itself on creating prosperity by lying and cheating other EU countries out of their tax income. Surprise! A government that lies on international treaties (they promised to enforce minimum tax since 2008, then ... didn't, then claimed credit for the "unseen in history prosperity boom"). Surprise! A government that does that ALSO lied to it's constituents and instead of delivering prosperity took 2/3rd of every euro you own.
"Oops, who could have seen this coming"