Got a reply today from the eBay vendor, as below.
My question:
Your description says the PC is an i5-6500 with Windows 11. How did you get Win 11 to install and run on a 6th gen CPU when Microsoft says it has to be at least 8th gen, like an i5-8XXX ?
Vendor's reply:
Dear XXXXXX
Thank you for your inquiry. We understand your concern regarding the compatibility of Windows 11 with 6th generation CPUs, such as the i5-6500.
While Microsoft's official requirements do specify 8th generation CPUs or later for Windows 11 compatibility, it's important to note that system compatibility can often extend beyond official specifications.
Regards,
XXXXXX