Electronic – Is this Mealy representation correct for 011

As written there,
"Moore outputs are synchronous with the clock, only changing with state transitions. Mealy outputs are asynchronous and can change in response to any changes in the inputs, independent of the clock."

In your specific case, Q0 and Q1 change sinchronously with the clock (because of the presence of the two D flip-flops), hence it's a Moore FSM.

The output Z is determined solely by the state and not the inputs. Therefore the machine is a Moore machine.

From Wikipedia:

...a Mealy machine is a finite-state machine whose output values are determined both by its current state and the current inputs.

(source)

..a Moore machine is a finite-state machine whose output values are determined only by its current state.

(source)