I also wrote to both Guest Services and the Mariner Society. Haven't heard from Guest Services. Got a similar canned response from the Mariner Society.
"Thank you for your recent correspondence with Holland America Line Mariner Society. We can confirm that the information regarding the removal of lunch on embarkation day is true. Unfortunately, at this time, there will be no room service available as an alternative."
No mention of a reason why or if the perk was being replaced with something else.