According to complaints in other threads on this forum, 8Y’s without traffic sign recognition do not show speed limits anywhere (unless using CarPlay/Android Auto). Cars with traffic sign recognition show the speed limit in the instrument cluster and on the HUD. (Though I don’t recall anyone with a HUD commenting, so that option might enable sat nav speed limits?)
My experience has been that the TSR system reads and sets the speed shown on the traffic signs. It has occasionally missed a sign - or set the speed based on a sticker on the back of a lorry - but its never misread a speed sign nor has it set ACC speed based on anything other than signs read by the TSR system.
How many times has the TSR system set the wrong speed for you, Frizzley?