I have this problem for years now
I am a Shop11 user and the same problem is still the same as with all the older Shoptodate versions
When people find a product using Google which is not in my shop any more because it is sold out at his moment and is not visible in my shop, they can still buy it.
When something is not visible in my webshop is should not be possible to buy it anyway.
There should be a link between being visibel or not and shop function
It would be a big improvement