A YouTube video of Lewes Bonfire celebrations affirms that Borough Bonfire Society wore Zulu warriors costumes with dark face paint for the parade.
The official website of Lewes Borough Bonfire Society affirms that during Bonfire procession, Lewes Borough Bonfire Society has a practice of wearing Zulu warriors costumes from the late 1850s for their bonfire night parade.
According to the Telegraph's article, the Lewes Borough Bonfire Society had agreed to stop painting their faces with black colour and started using other bold colours during Lewes Bonfire parade after anti-racism campaign in 2017.
The YouTube video uploaded by Ruptly shows that on 5 November 2017, the members of Borough Bonfire society were wearing the Zulu warriors costumes and painting their faces with bold colours in Lewes Bonfire Night parade. (Resume video at 0:28 seconds)
UPDATE: As per our reassessment, the judgement of the claim has been retained to be true but new pieces of evidence have been added and summary has been modified to suit the edits.
It was found that in 2017 there was an anti-racism campaign against Borough Bonfire Society for wearing Zulu costumes and painting their faces in black colour. Later, the society decided to stop painting their faces with black colour, and they started using other bold colours apart from black. The video shows (resume the video at 0.28) that members of the Borough Bonfire Society were wearing Zulu costumes along with their faces painted in bold colours during bonfire night parade.