Final answer:
The statement is false; Azure services in public preview can be managed through various methods, not just the Azure CLI.
Step-by-step explanation:
The statement that Azure services in public preview can be managed only by using the Azure CLI is false. Azure services in public preview can often be managed using various tools including the Azure Portal, Azure PowerShell, and other Azure management tools in addition to the Azure CLI. The method of management depends on the specific service and the features supported by each tool at a given time.