I suspect that is why all the 2018 minis got cut off even though they were sold throughout 2022 so by Apple's own rules they should be supported for Tahoe and Tahoe +1. The Intel HD 630 GPU is pretty gutless. It didn't help that the low end configuration was sold with 128 GB of storage.I've been around Apple long enough to see that this is a cash grab; by massively increasing gpu usage to render the glass effect, many many older devices are going to start feeling their age.
Apple is also being obstinate about the details of the T2 chip which makes it hard to repurpose those Macs to Linux. No tech specs and not even an Nvidia style binary blob so the OS can talk to the super secret T2. Got to get those old machines into the dumpsters as quickly as possible.
I wonder if Apple will use AI demands as a reason to cut off the M1's extra quickly too, or maybe all 8 GB RAM machines. They pretty much admitted you need 16 when they bumped everything up at once.