His explanation for the wrongly drawn trendline? – I haven´t read the article, bus as far as I have seen during the last 15+ yrs… those writers frequently draw chart lines regardless of classic charting rules (like e.g. Edwards & Magee)… but to simply sell their opinions or presumptions.
Re: Rhino Horn – definitely not in my Edwards & Magee, I just checked. I remember it from Jim Sinclair, representing a steadily accelerating but (or: therefore) self-exhausting (up)trend. Followed by “the fishing line with sinker” or so he said. He recommended the use of french curves; in case of an uptrend, he never drew an upper “rhino” resistance line as s´n´g did, though.