Strange article. Lots of text but missing the main thing I was looking for. What kind "erroneus trades"? where did the money go? If you buy stock at the market you did not intend to buy, why not just sell them the next day?
Essentially, they were buying high and selling low. Many times a second.
"The difference reached a peak at 9:58 a.m., when the volume was six times greater."
That's pretty noticable!