As of Hotfix H576, the Price Update feature will pass updates regardless of the method used to change them (Scripts, automated and manual imports, manual changes and Direct Database updates), provided that Price has a specific Source and SubSource value for that channel.
eBay price synchronisation is designed to speed up the process of updating eBay once a Linnworks stock item has had its listing price manually updated and saved, once enabled the live listing will be updated automatically within 5 minutes of the change being applied in Linnworks.