That’s the first I’ve ever heard of laser (used correctly) ruins the skin. Your aunt may be referring to early experience or the use of lasers with unsuitable patients.
For example, using a flashlamp or alexandrite laser on freshly tanned skin would definitely cause problems. Using a laser at maximum fluence on an African American with dark skin would cause problems.
Most medical treatments, whatever the area, can cause problems if they are abused.
I do not believe that lasers used on suitable patients by qualified and experienced practitioners working under the supervision of a dermatologist or plastic surgeon would ruin the skin.
Ask your aunt for evidence and scientific studies that show lasers ruining the skin.
IMHO the only good alternatives to laser hair removal are electrolysis and shaving. And electrolysis is not practical for large areas. For example it would take years to do someone’s back with electrolysis.