Hi there.
What you posted caught my eye, because I have recently been studying trend lines through various resources.
In one such resource, which I have attached an image of below, it is said that trend lines can be drawn from the wicks or the bodies of the candles. While Haejin's line is off from the wick by a hair, it could still be drawn upon that wick, I think. Also, once a trend line is drawn, the importance of sticking with that is emphasized, which I believe is what Haejin is trying to do.

I have also seen other analysts come up with the same chart as Haejin, except they are not being put down about it, such as https://steemit.com/cryptocurrency/@scaredycatguide/bitcoin-breaks-out-of-the-descending-channel .