even a kindergartener would argue that "lack of belief" does not mean something different than "lack of belief in gods or deities"
That's because kindergarteners have yet to understand that in conversation, context matters.
Most kindergarteners would also not know to read the debate description, where the resolution was explained in detail:
"Full Resolution: The definition of atheism should be accepted as merely "a lack of belief in a god"
That already explains that we're not just talking about some abstract concept of just "lacking belief". But I went on to explain it even further for those that needed their hand to be held:
"The definition contrasts with Con's position that the definition of atheism entails a belief in the non-existence of any gods. The purpose of the debate is to determine which of these two definitions should be considered the most reasonable to accept and utilize."
Perhaps if you read the rules of the debate before judging it you would have known what the debate was about.
False and demeaning to strict Atheists like Richard Dawkins who don't lack belief, they actively believe that there can be no gods and actively believe that belief in gods is wrong.
Does Richard Dawkins hold a belief in the existence in any dieties? Yes or No?
Your argument is that since all impartials and roundists are anti-flatists let's re-define all impartials and roundists as simply anti-flatists.
That's not even close to what I'm arguing.
First of all, no one cares to create terms for impartial flatists. This is a debate no one is seriously having, and has no real impact on anyone's life. Terms are created because there is a need for them. There is a serious need for theists and atheists to be understood within our society. There is absolutely no need for this conversation.
Second, I know of no one who takes the position that they simply lack belief in the shape of the earth, yet nearly every atheist takes the position that they lack belief in the existence of a god.
Third, there is only one earth, so whatever position you take on it is your position. Theism includes every god concept ever conceived, so there is no way to know what anyone's position is on any given subset of it until you ask them.
Fourth, "anti" means "against", so your term already assumes things that do not apply to the subset of people you are clumping together.
A belief that no gods can exist is a much more affirmative assertion than "simply lack of belief" and cannot be re-categorized as mere lack of belief without giving insult to those believers.
It's not a recategorization, it's broadening the definition to make it more inclusive. Someone who believes using contraception warrants the death penalty is pro life. That doesn't mean everyone who is pro life agrees with that position. Apparently, you think that means we should come up with a new term for that specific subset of pro lifers as to not lump them in with those who just don't think terminating a pregnancy should be legal.