September 2020. Holt revealed on Instagram two months later that the title of album would be Persona Non Grata and it would be released in June 2021. Former members Rick Hunolt and Rob Dukes joined the band on stage for a one-off reunion show in July 2017. Exodus appeared at the 2018 edition of the Rockharz Open Air in Germany, as one of the early bands on the main stage. The band also headlined the 2018 installment of the MTV Headbangers Ball European Tour (along with Death Angel, Suicidal Angels and Sodom) from late November to mid-December 2018, and toured Europe with Testament and Death Angel in February and March 2020 by taking part in The Bay Strikes Back tour. On April 13, 2021, three days after his 56th birthday, it was announced that drummer Tom Hunting had been diagnosed with squamous cell carcinoma of the stomach. As the result of his health issues, the band also announced that the release of Persona Non Grata would be delayed to November 2021. Exodus supported the album with a spring 2022 tour in North America with Testament and Death Angel, as part of the Bay Strikes Back tour, which was initially supposed to take place in the fall of 2021 but the COVID pandemic meant postponing the tour to next year. While Hunting was recovering from his cancer surgery, the band recruited drummer John Tempesta for the August 22 show in Las Vegas and the September 11 show in Cave-In-Rock. Hunting rejoined Exodus for their appearance at the Aftershock Festival in Sacramento on October 7, 2021. The band continued to tour behind Persona Non Grata in Europe and North America throughout the summer and fall of 2022, again with Testament and Death Angel, followed by another North American tour in January and February 2023 with Anthrax and Black Label Society. Due to "family concerns", guitarist Lee Altus did not participate in the European tour, and he was filled in by Brandon Ellis of The Black Dahlia Murder. About two weeks after the release of Persona Non Grata, Holt spoke to The Aquarian Weekly about a potential follow-up album. When the interviewer reminded him to "be careful about losing [his] cell phone", in reference to a similar incident in which Metallica and original Exodus guitarist Kirk Hammett lost his cell phone containing riffs that he had recorded for Hardwired... to Self-Destruct, Holt responded: