According to a postscript on that story, TfL have since commented:
This map was produced for engineering works planning and wasn’t designed for customer use, however we are happy to make any maps available which help our customers to travel in London. This map will therefore be added to our website.
Great result. We hope that thanks to Buzzfeed’s viral spread, from today, plenty more people understand the potential of FOI to change things for the benefit of many.