Yes, the current version of the Perl SDK (both with and without bindings) is compatible with 7-Mode. If they are using the new Perl API bindings, with 7-Mode, then setting the bindings_family to "7-Mode" is required along with a server type of "FILER". If they are using the standard NMSDK Perl with 7-Mode, then simply setting the server type to "FILER" is sufficient as it does not differentiate.
Leaving the bindings family at the default "Cluster-Mode" will probably work for some/most of the APIs, but not all of them, particularly if the bindings validation is enabled.
Hope that helps,
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