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 Spanish had T-V distinction, like most romance languages, but usted superceded vos as the formal 2nd person pronoun.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.
Which in some Brazilian soap operas sounded more like "vosmece" or "vosmercê", especially when said by people with country side accent (caipiras).
Weirdly enough, some colombians seem to despise this word or look down on us who use it.
Everyone everywhere is looking for excuses to put other people down, I guess.
The Spanish page has more information → https://es.wikipedia.org/wiki/Cundinamarca
That would seem not so odd, being ustedes the plural form of formal "you" usted, if not because ustedes should match "they" in verbal forms, while in fact it match plural "you". So no "ustedes saben" but "ustedes sabéis".
Even usted/ustedes is fading away, TV is so powerful. But I still hear that when back there for holidays.
For example, a university course I took tested for the proper conjugation of verbs with "vosotros/as" (with its typical usage in Spain). But I later read about some debate over why the usage of vosotros/as was tested, but not the usage of voseo (vos for the singular instead of tú), despite its usage being common in large parts of Latin America.
Some textbooks for language learners treat voseo by including it in the conjugation tables just for awareness, but not testing this in the exercises. Your hometown's usage of "ustedes" is quite interesting, and it would be great to see it documented in a learner's textbook somewhere, to further reflect the diversity of the language.
As a person who learned Spanish as a foreign language, let me assure you that none of this matters.
What matters is learning the language well enough to communicate without causing too much strain on the other person. If you can achieve this with a foreign language everyone will be really impressed and will understand if you learned one variant instead of another.
This link to the Spanish Real Academia web shows a verb conjugation (scroll down):
https://dle.rae.es/hablar?m=form
It includes the usted,vos forms.
The oddity is that this use of "ustedes" (only in plural, not for "usted") uses the verbal form for "you all" instead of the verbal form for "they", so it's weird for people from other parts of the country.
As for the use of "usted" in general, it's declining, specially in urban areas.
That is a very-very small number of people to write such an article, haha.
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Should be illegal