It totally is a deflection tactic.
With this, he gets 3 years or so whilst the system is being developed - maybe even until the next election is safely past, given that it will take a year to get it through parliament before they start writing it - without having to actually do anything about immigration. Any time it's mentioned, he'll say that the ID system will solve everything once it arrives...
Whereas we all know that it will cost billions, reduce our freedoms, put our data at risk from criminals, and do precisely nothing to stop illegal work and immigration.
Because the criminals will always have more financial incentive to circumvent the rules than the government have to keep it watertight.
It's completely predictable.