An LCD TV with an LED backlight is not a true LED TV. Maybe the buyer was expecting the display to be an actual LED or OLED panel.

The Sony website states in the specifications page that the KDL48W700C display is an LCD with an LED backlight:
https://www.sony.com.au/electronics/support/televisions-projectors-lcd-tvs/kdl-48w700c/specification...

Yet, Sony themselves have been misleading buyers by calling it an LED TV:
https://store.sony.com.au/archived-television-HDTV/KDL48W700C.html

Wikipedia entry:

https://en.wikipedia.org/wiki/LED-backlit_LCD