The spreadsheet does not give any information about this cabin. As there is no new current information posted on it, I am not sure if any of the cabins on Onward appear on the spread sheet.
When I was getting ready for my cruise on the Onward, there was information posted on cruise critic regarding the Owner Suites. The person posting stated that Owner Suites on the port side all had the combination tub like structure with shower and the starboard Owner Suites had the full shower. Mine was 7119 (starboard) and had a magnificent shower. If this information is correct, 6088 would have the combination.