Not any more waste of time than reading 90% of other tech news (or any news in general). It’s basically entertainment, not education.

So if I wasted some time reading a interesting article about some prototype technology, I haven’t wasted any more or less time than reading some news article about some other topic that doesn’t affect me.

I’m not holding my breath that this specific technology will beat Li-Ion in a year and I will not use the article as investment advice, but there’s nothing wrong with using it for free entertainment.