Yes and no.
So basically, they have added few things to steel to make the steel rim stronger, so its not steel completely. However with a common notion of how alloy wheels are, they are more like steel rim ... and bad part is they have put on fibre or plastic or carbonate material wheel caps which for a uneducated person may consider it to be a regular alloy wheel. if you remove the cap then you will see a kind of 4 spoke steel-alloy rim.
Note on Dura Alloy:
DURALLOY® provides effective protection from friction and vibration corrosion via a crack-free, precise, thin and ultrapure metallic chromium layer.
DURALLOY makes it possible to submerge a nodular structured surface in layers, and with a low process temperature of under 70°C, the structure of the base material stays the same during the plating process. This gives materials shape and hardness stability.
With its protection against wear and corrosion, DURALLOY increases the wear resistance of the material, making it suitable for use in applications such as gears or shaft-hub-joints.
By using a nodular structure, the layer of coating provides chemical resistance and material hardness. DURALLOY layers are most suited to the following areas:
High-temperature performance
Corrosion protection
Low friction
Lubrication
Protection against friction and vibration corrosion
Moving surfaces tribology
Wear protection
Materials that are coated with DURALLOY can be used in a range of areas, including:
Automotive sector
Decorative applications
Printing industry
Hydraulics
Industrial gears
Aerospace
Medical technology
Offshore applications
Textile machines
Bearing technology
Defence technology
Machine tools
Source:
https://www.aerospace-technology.com/products/duralloy/
So basically, if DuraAlloy on NRG is what is DuraAlloy on the above mention web, then it is a good thing Tatas have invested some technology in their car however, for general public, this may look like sham. Which is actually not required. Had they given steel rims without carbonate wheel cap,