Having a mechanical key hidden in the electronic key fob is nothing new, it’s common on many cars.
I remember playing with my parent's VW key fob as a fidget toy in the 00s. Little spring loaded switchblade style mechanical key.
My 2015 Honda had that and my new car does as well.
And yet my Hyundai key fob, despite being the largest fob I've ever seen doesn't do this :/
I guess my intent was not to point out that it has a mechanical key, rather that the description of the key on the webpage was wrong (it is not hinged).
The mechanical key fallback pattern is standard across the industry for sure.