Lumumba said the AFL's educational policies for players were inadequate and pointed to a 90-minute session that focused on"not being racist"as opposed to a wider theme of anti-racism.
"When you are dealing with the AFL,it has a well-publicised history of racial discrimination that black players faced throughout their time within the league,"he said.
"I was an extension of that. The AFL in 1995 brought out its racial discrimination policy. As an extension of that,when I got into the football club in 2004,it had not updated its definitions of racism. It had not continued on that journey and found ways to prevent the racial discrimination that I faced. Its inaction was actually a racist policy."
The AFL was contacted for comment.
Lumumba said suggestions he needed to front the investigation,which club president Eddie McGuire said would be done with"compassion",were"rather insulting"and he would not be surprised some would perceive his stance as"sulking".
"I am not surprised that it would come across that way to a lot of people who don't really understand racism. Australia's understanding of racism is at an elementary level and that is what I have had to deal with my whole time in Australia and that is what I have had to deal with in my whole time at the Collingwood Football Club and the AFL,"Lumumba said.
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"What I would say to that is,the reason why I will not participate in this so-called investigation is because they already have my truth. I have reported it to them,to administrators,to board members,to coaches,at the Collingwood Football Club in the two years prior to me leaving[to join Melbourne],which was in 2013 and 2014.
"I have mentioned it to players,I have mentioned it to the AFL Players'Association,I have mentioned it to board members and coaches at the Melbourne Football Club,I have mentioned it to psychologists and psychiatrists who are connected to the AFL and are AFL-affiliated.
"I did a feature length documentary about my experience ... which was later confirmed by six different players. So,for the Collingwood Football Club to suggest it needs to embark on this investigation to get my truth and wants me to participate in that,it is rather insulting."
Magpies coach Nathan Buckley maintains he had only ever heard the word"chimp"used was when Lumumba had said it himself. McGuire said he,too,had never heard it.
"I've never heard it[chimp] ... I'm not going to discuss this because we're doing an investigation,"McGuire toldFooty Classified.
"I know a lot of things that are going on now because I'm hearing things as well. We're going to do this (review) with compassion,we're going to do this forensically but we're not looking to prosecute,we want to find out what's gone on. I've spoken to some people and I've found different things,the nuances I had no idea."