I'm no fan of May's government, and I tend to agree about the (lack of) mandate. I think there should have been a general election when Cameron resigned.
However, my definition of a dictatorship, is, no elections, no opposition party, no independent judiciary. Think, Hitler, Mussolini, Peron, Stalin, Pol Pot etc.
We're not there yet.
I'm not allowed to take a phone/camera into testing facilities, server rooms etc to stop accidental/deliberate leakage of customer data.
This seems to me like an obvious step any government with half a brain between them would take to secure meetings such as this. No need to invoke the OTT 'authoritarian/dictator' rhetoric.