Depends on how you make and distribute your electricity
This paper states that induction, conventional electric, and gas are 90%, 72%, and 40% efficient respectively at point of use.
The efficiency of the grid depends on the efficiency of both generation, which depends on the fuel source and the operating conditions and age of the generator, and transmission/distribution which depends on the network configuration and overall demand.
While it is impossible to pick a number for this as it is dynamic, we can work out what it needs to be to make electricity more efficient than gas. For induction it is 44% and for conventional it is 56%.
Most modern grids will always be better than 44% efficient. In a few decades, smart grids and increasing renewable generation will make them better than 55%.
So, in general, the claim is not true, induction stoves are overall more energy efficient that gas stoves.
If you are considering greenhouse gas emissions, things get more complicated again because while gas stoves always use gas, electric stoves use a range of fuels - coal, gas, renewables - in ever changing proportions.