Earlier quoted context omitted.
This is hilarious, but I'm puzzled by his reaction to a hamburger menu: > Oh-oh. Drag-n-drop icon used for a dropdown menu - May 8, 2021 https://grumpy.website/post/0V_dyk3EP
You're only puzzled because of its ubiquity, and your accustom to it. Nothing about it inherently says 'opens a menu from the side'.
Also I agree with you -- perhaps the three lines represent a pictogram of a list (vertically stacked menu items?). And the triple dot version is either a compacted version of the same, or a vertical ellipsis?