The map locations of areas etc. and their canonical and non-canonical names should always be accurate. Of course the data may sometimes be out of date, new locations are not always added instantly (see also this item of this FAQ).
However, the information about authors / contributors of areas, their addition dates, and other anecdotal data may be less accurate, mostly for the "older" areas. Anything after 2005 or so should be pretty accurate, but data for earlier less so. Much of the information originates from old newsposts made by wizards, other such notes, file modification timestamps of code, interviews with wizards and players, and multitude of other sources. Inaccuracies with such "folklore" type information are inevitable.
Many of the earlier addition dates may actually be for the big "1996 conversion" or somewhat after that, while those locations may have actually existed before the stated date. They may also be for further recodes or changes, if earlier dates have not been found (or confirmed by some means). I have attempted to record the earliest "known" date when the area has almost certainly been in the game, though for the previously stated reasons these may not be very accurate.
Additionally methods of "best estimation", deduction, guesswork, magical thinking and time travel may have been employed to obtain dates and information when more accurate sources are unavailable.
Caveat Emptor.
Currently this data is available through the Mercurial repository of Ggr's MapUtils. You may also be interested in the utilities themselves https://tnsp.org/hg/batmud/maputils/ and especially the file "README.loc", which contains some documentation on the format of *.loc-files.
Bat Ry provides the raw ASCII map data for the BatMUD continents, which is updated at every game reboot: