The suit is being brought by Porto Rico Christians in a Porto Rico court. The damages if any will be paid to them. The only Israeli involvement is providing expert witnesses, and other witnesses who were in the airport on the day of the massacre. All the Israeli support is pro bono. as for collecting the damages there may be some frozen assets of North Korea in US institutions.
Mexico approves U.S. extradition warrant for fugitive kingpin 'El Chapo' (Reuters)
from the article: Israeli rights group sues North Korea over 1972 terror attack