I wouldn't call it a complete whitewash. There is this:
Capture of towns and villages were accompanied, very often, with their destruction and the massacre of the inhabitants.
Given the historical obsession with Vlad Tepes and his unfortunate tendency to impale his enemies on poles, seems odd to leave out Timur's pyramids of human heads.
Timur’s campaigns are infamous for their extensive massacres and emblematic “pyramids of heads”.
Of course Wikipedia wouldn't cover up Islamic brutality while playing up the atrocities of those who fought against the jihad, would they?