This is one of those cases where a hosta has been
known for a number of years under one name but evidence arises that it was named
something else at an earlier date. That earlier name takes precedence when it
comes to plant names.
Field Guide to Hostas by Mark Zilis (2014), this cultivar was "registered as the cultivar 'On Stage' in 1986 by Paul
Aden...but 'Chōkō Nishiki' is
now recognized as the correct name."