If this is Steve Dekorte's Io, then the Io page that was at http://www.iolanguage.com/ stated in 2004 that it was like LISP in that "code is a runtime inspectable/modifiable tree". This is not homoiconic in terms of syntax of rather in terms of data model.

Io is so in perhaps the same way as Pico http://pico.vub.ac.be/ is because Pico expresses the code as data type though of specific types which are not normally used for user program data.