You have it right Paul. The loss of recency and with expiring IR/PCs by the day the backlog builds up very quickly. In three months half your pilots no longer have a valid licence, and need four hours simulator time to renew. (The time can be reduced by agreement with CAD, which would be forthcoming under the circumstances.)
That is why when the airline gets back to flying it will be a slow ramp up process, not "everybody back on line, yoo hoo!" I don't know how many A350 and 777 sims CX has now but at 6 sessions a day per unit it will take months to get everyone current again.