You are correct, that's not the only way to draw a triangle using the borders. I updated the article to add a note indicating that those are the steps for that specific triangle and other triangles will be slightly different:
Note: The steps above are for a specific triangle. The actual steps will change (slightly) depending on the type of triangle that we want to draw. In general, the idea is to set 2-3 borders as transparent and 1-2 borders with color and then adjust the border sizes.
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You are correct, that's not the only way to draw a triangle using the borders. I updated the article to add a note indicating that those are the steps for that specific triangle and other triangles will be slightly different: