The OFM database and charts are not authoritative. Neither OuterWorldApps nor OpenFlightMaps warrant that any information contained is accurate or useful for any purpose. Always be extremely skeptical regarding any information provided by the database and/or charts.
The indication of valid to simply indicates that the information was obtained from OpenFlightMaps within 56 days prior to that date. It does not indicate that it has been verified in any way or is accurate to any extent.
Read the OpenFlightMaps General User's License linked at the bottom of the OpenFlightMaps page. Any errors discovered in the database should be reported to info@openflightmaps.org