Yes but I can't find confirmation on when he said it. A few years ago, he apologized for it and I took someone's word on the date of the statement but I found one article which has a 2008 date on it.
But, yeah, he def said it.
Pierre 'accidentally' said the n-word when pronouncing "Nijjar". There is no way to throw in a hard-G on two J's unless you're used to using the n-word freely.
"Canada's Aboriginals need to learn the value of hard work more than they need compensation for abuse suffered in residential schools"; Pierre Poilievre, June 12, 2018