It's industrial design or product engineering, not science. They applied a known system of using "phase change material" to regulate the normalisation of the temperature of the contents of a vessel, in this case coffee/beer in a mug/stein.
Interesting though.
I started to try to write something deploring the incessant use of the word "intelligent" to things that are basically a good implementation of a clever idea, but gave up.
Your point is exactly right. The coffee mug isn't intelligent in any sense, it's the result of clever insight, followed by excellent implementation.