ASHRAE Mandatory Provisions & Existing skylights not replaced

Hi everyone, I'm currently working on a major renovation project. The owner is renovating & insulating the entire building but doesn't wish to replace the existing old single glazing skylights for budget reasons. Obviously, the existing skylights don't meet the ASHRAE Mandatory provisions. The question is, are the skylights excluded from the need to meet the mandatory provisions since they are not part of the scope of work on this renovation? Or does the ASHRAE mandatory provisions are forcing us to replace those skylights in order to be certified? Thank you in advance, Regards,