The passenger locator form is no longer required for entry into Italy effective 1 May 2022. See:
https://www.salute.gov.it/portale/nuovocoronavirus/dettaglioContenutiNuovoCoronavirus.jsp?lingua=english&id=5412&area=nuovoCoronavirus&menu=vuoto.
Specific relief is in the "Ordinance 28 April 2022" link, an Italian pdf, at https://www.trovanorme.salute.gov.it/norme/renderNormsanPdf?anno=2022&codLeg=86920&parte=1%20&serie=null.
The pertinent part translated at Bing states "Art. 1
1. The measures ordered by the order of the Minister of Health of 22 February 2022, with the exception of the provisions of art. 1, paragraph 1, letter a), are further extended until 31 May 2022.
2. This Ordinance shall take effect from 1 May 2022 until 31 May 2022."
The referenced "art. 1, paragraph 1, letter a)" is the passenger locator form.
Bob