The reality is much more complex.
First, it's important to analyze the link you just provided: it lacks several citations on key claims, and the main claim it makes (right on the first paragraph) comes from a source of a website, which mentions a study performed more than 20 years ago. While this doesn't mean the study isn't valid, we would first need to check the the details before determining whether this sleep is harmful or beneficial to you. At the same time, historical accounts of this byphasic sleep don't necessarily mean it's the best for humans: it's simply the norm, as it was the norm to use lead on loads and loads of products and technology.
Now, while we do know that the 8 hours sleep is a myth, this is only because we know that there is variation, not that sleeping few hours is more beneficial to everyone. And this is precisely what happens during most WBTB: although some people take into account this loss, many simply WBTB effectively loosing 20-60 minutes of sleep just to WILD. One could argue if that was healthy at all, but since we still don't have enough data, conclusions can't be made either way. Caution is advised: WBTB and WILD may not be for everyone.
Even more problems surge with the sometimes called "micro WBTB", since studies do point out on the negative impacts of awakenings during the night, which seem to have just as of a negative effect as loosing some hours of sleep. What's more, is that even if you feel fine, you may still be sleep deprived, because people tend to over evaluate their cognitive performance when sleep deprived.
More normal: seems so. But still not necessarily better or in any way indication that WBTB is healthy (although I'm not accusing you in any way of advocating the contrary).
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