Yes, I have been digging around looking for that. I believe it was one of the changes they made to entry requirements on Aug. 28.
The "Official" website: https://www.salute.gov.it/portale/nuovocoronavirus/dettaglioContenutiNuovoCoronavirus.jsp?lingua=english&id=5412&area=nuovoCoronavirus&menu=vuoto
Has yet to be updated, but the IATA Travel Centre: https://www.iatatravelcentre.com/ has been updated, and if you go to the covid requirements map, click on Italy, Article 11 indicates that if in the last 14 days you were in, or transited any of several EU countries, a test on arrival will be performed. You may be fine if you flew to Italy direct from the US, however I transit in the Netherlands, one of the countries listed.
I will try to update Wednesday after I (hopefully) get there.