I agree wholeheartedly for the simple reason that the example in the article is destructive. It doesn’t only alter the quote, it reduces it. In my mind brackets, or sometimes parentheses, should only be used to add information to assist the reader. To remove a word and replace it with another within brackets is in my mind fundamentally and thoroughly wrong.

Personally I use “(…)” to signify cuts, or “[word]” to include a word missing in the quote, but is necessary to avoid the language being annoying to read. I would never dream of changing words in a quote to fit my own text.