When they start talking in terms of "absolute time", I leave it. If they don't know what time to use, then us UTC, because that's what everyone else uses.
These Wiki articles are not written by any one person and anyone can modify them. You get it 'warts and all' -- there is much good stuff in there and some useful references. If you have the time, you can modify the errors and silly bits yourself -- you only have to log-in after registering and learn the special Wiki-speak code. Certainly don't dis any Wiki item for one or more faults...sort the wheat from the chaff.
Edit -- Have checked the Wiki ref to the BEA pdf which states all times UTC yet the Wiki article is using what it calls 'absolute time' which is defined as time from planned departure. We are not told who decided to use this 'absolute time' or why, but it is defined -- maybe there is a custom in another discipline (not aviation or navigation?). I don't know but it is defined and seems not to be just sloppy reporting.