Why isn't Cliff Williams touring with ACDC?

Could you please elaborate on the reasons behind Cliff Williams' decision not to tour with AC/DC anymore? It's quite surprising given his long-standing tenure with the band and their iconic status in the music industry. Are there any health issues or personal reasons that have contributed to this decision? Or is it a matter of creative differences or a desire to pursue other musical endeavors? We're all curious to understand the dynamics behind this change and how it will affect the band's future performances and releases.