It most certainly was not intended to be interpreted as that.
A language implementor is one who writes a language implementation: i.e., a compiler. As such, the standards carved out a namespace especially for them, one in which tokens begin with a leading underscore (and there are further rules). That is the nature of the inquiry: "are you familiar with when you can and cannot use leading underscores?"
I gotcha. I could only guess your opinion was meant to be destructive and not meant as an inquiry. I guess I took the wrong meaning of the word "implementor" too personally. Sorry about that. Though the other guy... I'm not sure what his deal is, truly.
P.S. Your link
Oh haha, yea. Now I see what you meant exactly -- but very minute. That's like saying that all multi-line comments should have '*' before each line because the programmer for VIM decided he wanted to put those as the default spacer when you start a comment. I use underscores to help make my own variable names or structures easier for me to read. We all have our own coding styles. Some like to go to the next line when they write a function to open their brace, some stay on the same line, some write BS 'net bios attack' applications to trick newbs, and others take the time to learn. It's all in what you prefer.