I am sorry if I seem repetitive, but I feel like you are still misinterpreting my question. The discussion you linked regarding lubricating HDZ Z carriage blocks does not apply in the context of the Shapeoko Pro X Y axis. This thread also does not explain anything. Those real Hiwin carriages all have a removable screw for lubrication. The Shapeoko X Y carriages do not.
One cannot lubricate the Shapeoko Pro X/Y carriages. These carriages have the oiling port filled with some sort of silicone, not a removable screw.
So we are limited to adding some oil to the X Y rails on the Shapeoko pro, hoping some oil from the rails getting past the carriage wipers and into the bearings? Really hope it holds up long term against fine particles such as MDF dust.