I would NOT be expecting any passenger services to resume anytime soon between Ireland and Spain following the latest announcements today.
Below was reported in The Telegraph online this evening at 16:48hrs
"4:48pm Spain to restrict entry for 30 days over coronavirus" is a sub-headline under it's main headline:
"Live Coronavirus latest news: Government outlines isolation plans for 1.5m vulnerable people, with food from councils and help from Army"
Spain will restrict entry for most foreigners at air and sea ports for the next 30 days to help stem its coronavirus epidemic, the Interior Ministry said.
The ban - starting at midnight - comes a few days after Spain imposed restrictions on its land borders with France and Portugal, after European Union leaders agreed to close the bloc's external borders for 30 days.
Spanish nationals, foreigners living in Spain, air crew, cargo and health workers and diplomats will be allowed to travel as normal, the ministry said in its statement."
Source: The Telegraph
This will likely result in further delays to the resumption of Brittany Ferries direct link between Rosslare and Bilbao in Spain which had only launched towards the end of February when it replaced it's previous ferry link between Cork and Santander.