Don't need to read between the lines. Last year when faced with training captain shortages, training management pointed out to senior management that the life of a training captain would hardly be an incentive given the amount of days off available (and controllable) on the line.
The stated response was that the solution was to make the line pilots roster less desirable. (No guesses who said that!)
The cutting back on line sectors for trainees was in a similar vein. After release to line they will only fly with experienced captains for the next sectors. Hence some of the line training is outsourced to line captains. As a result the designation of LTC as a training post is being removed.
So after requesting many line captains to join training and not getting the required numbers they simply force them do the training anyway and save the money!
Line captains, be aware that some of the rostering adjustments are to cater for training restrictions.