gnillort's Journal: (non?) Modbombing

I'm new to this whole concept of mod-bombing, so please help me out and tell me what is missing/added to my definition. I have two e-mails below:
1. An email from me to Rob Malda (CmdrTaco) telling him about a (in my eyes) modbombing incident
2. An email from Rob Malda to me telling me that it isn't modbombing

NOTE: This is in no way intended to be disrespectful to Rob. I am very grateful for him taking his time to respond to this, and for him allowing users to e-mail him. I am just doing this to determine what modbombing actually is, because I apparently have a wrong definition.

• 
  Date: Mon, 21 Oct 2002 08:52:47 -0700 (PDT)
  From: [e-mail]
  Subject: modboming incident
  To: [e-mail]

  recently, 3 of my comments were moderated as overrated in a two minute span. I think that whoever moderated those 3 comments is the same person, so I wanted to notify you.
  _______________________________________________
  Moderation of "Counterstrike is dying"
  sent by Slashdot Message System on Sunday October 20, @08:08PM

  A user has given a Overrated (-1) moderation to your comment, Counterstrike is dying, attached to The Rise Of Counter-Strike. Your comment is currently scored (3).
  ________________________________________________
  Moderation of "According to my calculations..."
  sent by Slashdot Message System on Sunday October 20, @08:08PM

  A user has given a Overrated (-1) moderation to your comment, According to my calculations..., attached to Unmaking The Game. Your comment is currently scored (4).
  _________________________________________________
  Moderation of "Sorry sir.."
  sent by Slashdot Message System on Sunday October 20, @08:09PM

  A user has given a Overrated (-1) moderation to your comment, Sorry sir.., attached to The Rise Of Counter-Strike. Your comment is currently scored (-1)
  

Rob's Reply:

• 
  Date: Mon, 21 Oct 2002 12:37:06 -0400
  Subject: Re: modboming incident
  From: "Rob Malda"
  To: [e-mail]

  Honestly I think these mods are fine- the first 2 are still scored 4 &
  3... an "Overrated" mod is completely appropriate if the moderator felt
  that they weren't good enough to warrant the higher score...

  The last one is just feeding a flamer/troll. You should ignore them.

  And don't email from yahoo.com- I filter it as spam. Its a miracle I
  noticed this.

What don't I understand about mod-bombing which makes this not a mod-bombing incident? All I know about mod-bombing was acquired from sllort's Modbombing Disable HOWTO for Slashdot. Any insight?