ChatGPT seems to be absolutely incapable of producing Spenserian English. I think that the LLM has probably excluded aberrant orthography, archaisms, etc.
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I asked it to write the Lord's Prayer with Shavian orthography, and this is what I got (somewhat comedically):
Ɔ́ύә́ Fáthә́, ώύә́ á́rт ө́н һévә́n,
һállә́ώύә́d bé θә́ ә́néύm.
Θә́ ә́ύkә́nә́m cύm,
θә́ ә́ύl dύn,
ύn ә́ύθ á́s ít ís ө́н һévә́n.
Gív ә́s θís deύ θáύ délә́ύ bréd,
á́nd fә́rǧív ә́s θáύ tréspásә́s,
á́z ώé fә́rǧív thóz ώύ tréspás á́génst ә́s.
á́nd léd ә́s nót ө́ntύ témptéišn,
bύt délívә́r ә́s frύm ívә́l.
