As far as I am aware Norwegian has an ATO (in some part of the complex model) . Airlines would normally not allow rating to lapse in order to avoid the "training as required" rules by EASA. If the Pilots are type rating lapsed either the Airline has given them the bums rush or they have been told it will all be fixed when/if they come back online, in any event there is no need for an "employed pilot" to have to arrange their own revalidation unless they feel the end is nigh and they want to keep current for job seeking purposes, which given the situation at NLH is highly likely. An OPC may be incorporated in an LPC, as you state if the rating is expired then the ATO must determine the training requirements.