I tend to agree that Julia and other modern programming languages with hygenic macros aren't "homoiconic". Maybe GP is making a point about the title of this presentation? Read generously, maybe he's criticizing calling this homoiconicity by comparing it to Julia which originally claimed to be homoiconic but removed the claim from its website because of contentiousness[1]?
[1] https://groups.google.com/g/julia-users/c/iKxqn-J9frI/m/QzaS...
He could be making that comparison, but I read the comment as "I use Julia btw", and that's what I took issue with. I wrote a comment to dismiss it and save face for Julia programmers.
The article is reading way too much into it, and it forgets a very important piece of information: The origin of usted is "vuestra merced". Spanish had T-V distinction, like most romance languages, but usted superceded vos as the formal 2nd person pronoun.
sumercé is a word that had the same process, just starting from "su merced" instead, since in Colombia —like in all other latin american countries— vosotros is not used.
That's it.