Like most cut'n'paste articles in this forum, this is incorrect.
Height above sea level = 4,770 ft, but the viewing platform is only ~1,160 ft (350 m) to the river below, and a vertical drop or direct fall is ~500 to 800 ft (150 50 240 m).
Reference: https://en.wikipedia.org/wiki/Grand_Canyon_Skywalk#:~:text=It opened as a tourist,the Grand Canyon National Park.&text=USGS topographic maps indicate the,1%2C160 ft (350 m).