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Re:Larry Page: I’d Rather Leave My Billions to Elon Musk Tha... by dfc on Thursday March 20, 2014 @05:48PM (#7439063)
Precisely this? When is this not precise?

  this

  1.  Used  to identify  a specific  person or  thing close  at hand  or being
      indicated or experienced
  1.1 Used to introduce someone or something
  1.2 Referring to the  nearer of two things close to  the speaker (the other,
      if specified, being identified by ‘that’)
  2.  Referring to a specific thing just mentioned
  3.  Used  to identify  a specific  person or  thing close  at hand  or being
      indicated or experienced:

More: http://www.oxforddictionaries.com/definition/english/this?q=...
Re:Larry Page: I’d Rather Leave My Billions to Elon Musk Tha... by nl on Thursday March 20, 2014 @08:32PM (#7439900)
"This" on its own as a word indicating agreement is a fairly recent usage.

Notably, the very definition you posted makes no mention of that usage. From that definition there is no way to tell if "This" on its own means "This predeceeding comment is completely wrong" or "This predeceeding comment is completely right".

Also, "precisely" indicates degree rather than the generalist term "this". For example, "I'll meet you at this time tomorrow" and "I'll meet you at precisely this time tomorrow" have different connotations for how accurate you are expecting to be.