This tool reports one thing: whether a connection request you send arrives in an inbox we control. That is a delivery result on our own side of the wire, read once a minute for two minutes, and it is the whole of what we can see. We cannot see how an account is ranked or how its content is distributed, and we do not infer either from a delivery result. What people mean by a shadow ban, and what the platform itself publishes about it, is set out with its sources in the LinkedIn shadow ban guide.
It cannot see whether your posts are being shown less, and it cannot tell a dropped invitation from one you never sent. So read the result as one line of evidence. Arrived rules out the loudest fear: your account can still send and be received. Not arrived is worth taking seriously only after the mundane causes are excluded, and the page tells you which ones. For the full diagnosis, the search test, the impressions baseline and the recovery sequence, read the LinkedIn shadow ban guide.