Just a Side note in the Kroptkin book:

"All is interdependent in a civilized society; it is impossible to reform any one thing without altering the whole. Therefore, on the day we strike at private property, under any one of its forms, territorial or industrial, we shall be obliged to attack them all. The very success of the Revolution will demand it."

That looks a little bit like rule by force.

Also in that last link:
"One last point: to state the obvious, this is not the final word on anarchism. Many anarchists will disagree with much that is written here, but this is to be expected when people think for themselves. All we wish to do is indicate the basic ideas of anarchism and give our analysis of certain topics based on how we understand and apply these ideas. We are sure, however, that all anarchists will agree with the core ideas we present, even if they may disagree with our application of them here and there. "

So using that as a source of definition is somewhat self defeating. (Plus the quotes by Tucker, who was typically seen as anti-communist, which is a really strange inclusion for defining anarcho communism)