The map might label a plot as "Residential," but it won't tell you if the building is luxury or budget. You must check the specific building name against property portals to see the quality.
Disclaimer: Nakheel updates these plans periodically. The following sources are the most reliable as of 2024/2025. jvc master plan pdf
Buried on page 39, under "Contingency for Total Victory," is a line in Japanese that translates roughly to: The map might label a plot as "Residential,"