Hi @MS Techie - The answer is basically yes to officially supported distros that are published to the Azure Marketplace. It is a requirement that the 3rd party provide fixes and updates: Image Update Cadence
Please also see supported distributions and versions (link). If the image was brought to Azure as a VM image, that would not be subject to automatic updates. These are the instructions for Azure Marketplace PostgreSQL image: Install and configure PostgreSQL on Azure
Please let me know what else I can provide you.
Regards,
Mike