Entrypoint refers to the identity of a site in a multisite deployment where VPN needs to be uninstalled. It is not applicable ...

Entrypoint refers to the identity of a site in a multisite deployment where VPN needs to be uninstalled. It is not applicable to DirectAccess. 
If entrypoint is not specified then the entrypoint to which the server on which the cmdlet is executed belongs is used. The server could also be represented using the ComputerName parameter.
If both entrypoint and computername are specified and the ComputerName does not belong to the site represented by the entrypoint then the entrypoint takes precedence and VPN is uninstalled at the site indicated by it.
Note that in a multisite deployment case VPN can only be uninstalled one site at a time.

Entrypoint refers to the identity of a site in a multisite deployment from which down-level clients are removed (these clients ... Entrypoint refers to the identity of a site in a multisite deployment to which down-level clients are added, i.e., these ... Entrypoint refers to the identity of a site in a multisite deployment to which down-level clients are added, i.e., these ... Entrypoint refers to the identity of a site in a multisite deployment where VPN needs to be installed. This is required in ... Entrypoint refers to the identity of a site in a multisite deployment where VPN needs to be uninstalled. It is not applicable ... Entrypoint refers to the identity of a site in a multisite deployment whose health needs to be retrieved. If both entrypoint ... Entrypoint refers to the identity of a site in a multisite deployment. All security groups and Group Policy Objects are displayed ... Entrypoint refers to the identity of a site in a multisite deployment. It is applicable only to RADIUS server configuration ... Entrypoint refers to the identity of a site in a multisite deployment. It is applicable only to RADIUS server configuration ...