Earlier quoted context omitted.
No. It’s written to be funny but I can vouch that these rules, such as they are, are all more or less correct.
I asked my daughter and her friend who was with her (both 20) if there's a difference between "I'll be home" and "I'll be home." They confirmed, and said the latter is much more serious. And this is in The Netherlands. I proposed that they were (sort of) pronouncing the punctuation, as in "I'll be home. Period.", and it seems to sound that way. Odd, but it seems wide-spread.
I do not think you can think of it that way. It's said that the subtleties of spoken language are lost in text, but in this case, the subtleties of the written word are lost in spoken language.