Underfunded pension DB schemes were fairly common in the last recession and most were converted to DC schemes resulting in a loss for people who were due to retire at that time. You should contact the administrators of the scheme and ask for your options.
Pensioners priority up to €12000 only. No increases. There is no differentiation between deferred and active members. They get treated the same.
Different rules apply when the employer is also insolvent ( assuming that is the case with the liquidation) - double insolvency.
The state gets involved in funding part of it if necessary.
Pensioners ( i.e. anyone with a pension in payment from the scheme fund) will still be covered 100% up to €12000/annum. Some other rules for how pension increases are treated.