Hm. Homoiconicity is not a well-defined term (see, for example, Shriram Krishnamurthi's thoughts [0][1]), but even skimming over that fact, it is a syntactic property, while the quoted line is about semantics. Switching your language to Lisp (or one of its descendents) doesn't gain you anything semantically.

[0] Shriram is an original member of the Racket project, so he's been working in the Lisp-like domain for at least 30 years and, specifically, he works in an offshoot of Lisp that is particularly concerned with questions of syntax. I think this establishes him as a reasonable citation for this topic.

[1] https://parentheticallyspeaking.org/articles/bicameral-not-h...