Per the link below, It seems when Solarwinds Released the Meraki Dashboard Integration, the Status of the Access Points are not accurately polled. In fact, it says that the status of the AP cannot be polled against the REST API.
It says to create a Feature request for this
Link below
Offline Meraki access points show as Up - SolarWinds Worldwide, LLC. Help and Support
Updated: March 27, 2017
Overview
Offline Meraki access points show as Up - SolarWinds Worldwide, LLC. Help and Support
Environment
Cause
Meraki does not provide the status of access points through the REST API. When NPM polls Meraki access points, the access points are always shown as Up in the Orion Web Console.
Resolution
This is by design. You can submit a feature request for Meraki to provide the access point status information through REST API.