Are all definitions included in SEP 14 client?

Hi,

We are a small lab with an air-gapped network. We run SEP on the client machines, with a SEPM server and a LiveUpdate server (which periodically is switched to an Internet enabled connection). In the datasheet for version 14 it says

Intelligent Threat Cloud's rapid scan capabilities [...] has made it unnecessary to download all signature definitions to the endpoint to maintain a high level of
effectiveness. Therefore, only the newest threat information is downloaded, reducing the size of signature definition files by
up to 70%, which in turn reduces bandwidth usage.

Will we still have complete protection against old viruses after upgrading to version 14, even if neither the end points nor the SEPM server are connected to the Internet?

Thanks,
Marius