I usually take it as, they installed Linux on it and support it. I will use my own install after formatting a drive (or carrying one over from the previous mach

I usually take it as, they installed Linux on it and support it. I will use my own install after formatting a drive (or carrying one over from the previous machine) but it’s more like a seal of approval that Linux works. And if the company are good stewards, they will upstream any drivers/kernel modules for that hardware too.