One must know what "astroturfing, shiling, brigading" are to follow that rule. As such, astroturfing is the labor in putting fake grass down. Shiling, I'm guessing is giving the money item, a shilling, to someone. Brigading, I guess is starting a brigade. My point is that making up, or using new words(not in the dictionary) and using them in a guideline without defining them, nullifies the rule to most of the populous. Also, dang is super responsive to HN comments that he finds incongruent with the rules. He'll be here shortly to chastise OP and me.

Astroturfing in the most famous English dictionary:

https://www.merriam-webster.com/dictionary/astroturfing

Brigading in the most famous English dictionary (see definition 2):

https://www.merriam-webster.com/dictionary/brigading

Oxford English Dictionaries might like a word about your fame assertion... :)

Merriam-Webster is a popular a publisher of American-English dictionaries: emphasis on American. It also had a significant role in shaping American-English as distinct from British-English. E.g. removal of the letter u in British-English words like colour. Or, the unsuccessful campaign to spell the word acre as aker.

That's false. Webster is the dictionary that had a role in shaping American English in a distinct fashion. The quality of the work deteriorated when the Merriam brothers purchased it, and they changed the title from Webster's by the time they had begun compromising the value of English reform.

You're right. I thought it was Webster that acquired Meriams' company.

Oxford has astroturfing too: https://www.oed.com/view/Entry/325483?rskey=aidQ7O&result=2&...

Shilling does have a NorthAmerican connotation: https://www.oed.com/view/Entry/178128?rskey=UvAWn2&result=4#...