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There are two preprints available:
https://arxiv.org/abs/1910.11598
http://people.math.harvard.edu/~kupers/files/k8zshorter.pdfhttps://www.utsc.utoronto.ca/people/kupers/wp-content/uploads/sites/50/2021/01/k8zshorter.pdf
http://people.math.harvard.edu/~kupers/files/k8zshorter.pdf
https://www.utsc.utoronto.ca/people/kupers/wp-content/uploads/sites/50/2021/01/k8zshorter.pdf
