Roaming the earth means roaming all - or at least a very significant portion of - the earth, not some very isolated region. So I would say yes - if some tiny population of mammoths was still alive in some limited area at this time, they were not ‘roaming the earth’.
Roaming the earth means roaming all - or at least a very significant portion of - the earth, not some very isolated region. So I would say yes - if some tiny population of mammoths was still alive in some limited area at this time, they were not ‘roaming the earth’.