The material is believed to be a type of intumescent material and products with roughly similar properties are commercially available.
...intumescents produce a light char, which is a poor conductor of heat, thus retarding heat transfer.
Seems it has been replicated, or since we don't know what it was something with similar properties has.
In addition, a company named Thermashield claims to have aquired the rights to the original Starlite and has their own demonstration.
And, finally, YouTuber NightHawkInLight has a video showing how he created a material which can replicate the original StarLite demonstrations out of corn starch, baking soda, and glue. He explains how it works by creating expanding, insulating foam of carbon which dissipates heat very quickly. He has a very dramatic video melting pennies in his own hand. Don't try this at home.
