What it does is make explicit that statements made that would normally be subject to parliamentary privilege could be used in evidence against them if there was, for example, a prosecution under the Security of Information Act for a person who was otherwise permanently bound to secrecy. It's not as wholesale as saying parliamentary privilege does not apply, but it is being expressed as to what use can be made of a statement that would otherwise be subject to parliamentary privilege.
On November 29th, 2016. See this statement in context.