Many, but not all, of the anti -pasteurization people believe that there is an invisible “life force” in the milk that is killed by processing. This is an old idea, but this unfalsifiable and unprovable “life force” thinking undergirds a lot of pseudoscience. People believe in getting energy aligned and unblocked and so on, and believe that drinking milk with mysterious life force is more natural.
This map is apparently from Wikipedia, and is based on a 1995 CIA ethnolinguistic map. The version here is identified as from 2007, with some changes made by wikipedia commons editors (visible changes in Abkhazia and other places). The changes are marked as disputed and unsourced, and it does seem like someone took the letters marking general presence of an ethnolinguistic group (indicating sporadic presence) from the 1995 map and converted those letters into solid bands. This does seem to be a dubious change, as I cannot find any support for this solid separation of groups in Abkhazia and elsewhere.