The events that led to the conquest of northern Africa by Arabs took place what, 1000+ years ago? You can hardly argue that “Arabs are colonialists” in modern times by judging 1000+ years old historical events, in the same way you probably wouldn’t judge modern Greek people as colonialists because they speak an Indo-European language and Indo-European languages are spoken all over the continent of Europe and much beyond.
If you read the article, it’s talking about a 2-year anniversary of some deliberation made by UN, not about any new evidence of anything. There’s a claim of “hundreds of thousands still remain wrongfully imprisoned”, but I beg you to find a source for that because the article doesn’t provide any… because it’s not true. The focus of the article is “there’s been no punishment yet on any Chinese officials, and the laws are still in place”. No (sourced) metrics of people suffering any abuses, nothing, just a general condemnation without evidence. Did you even read it?