You have the situation in reverse. Ventura is the latest edition of the operating system, which is where the backup was made. High Sierra is a few versions back. So he’s trying to restore a backup that contains some OS-specific elements to a far older operating system. The progression is High Sierra->Mojave->Catalina->Big Sur->Monterey->Ventura. So this is an OS that’s five or so releases back, dating to 2017.
Clarification: I know he’s just trying to look at it in Finder, but Apple’s got plenty of “baby rails” to keep people from corrupting their operating systems. This is, for example, why SIP (System Integrity Protection) exists. Thou shalt not touch the kernel.
No, Apple Silicon-based Linux is why VMware Fusion exists. 😉 You can currently virtualize ARM-based distros, but if this new release leverages Apple’s implementation of ARM for M-series chips better, I’ll probably create a new VM and migrate what I need from the old one.