Robert Oostenveld has tested the Unicorn Black by g.tec medical on his blog – is this a paper which was rejected by a scientific journal?

Robert Oostenveld has written a lot of papers: https://scholar.google.com/citations?user=eEbaa0UAAAAJ&hl=de&oi=ao and has been cited 47 721 times to this date. Why does a scientist test the Unicorn Black by g.tec and publishes the results on his blog? Which scientist does this? The ones who have submitted a paper about the Unicorn Black by g.tec to a …