The title is only indirectly unambiguous through context and logic. It could still be improved and made less ambiguous through better word choice.
The fragment “People in present day Austria” does not alone indicate the past, it requires “2700 years ago” to know for sure.
If you say “People in present day Austria drink beer”, it automatically implies people there today drink beer. If you say “People in present day Austria drank beer”, it implies they drank beer recently. “People in present day Austria drank beer 2700 years ago”, while eventually unambiguous that it means the past, still leads the reader on an unnecessary roller coaster of first implying the present and then clarifying it means the past.
The fragment “People in present day Austria” does not alone indicate the past, it requires “2700 years ago” to know for sure.
If you say “People in present day Austria drink beer”, it automatically implies people there today drink beer. If you say “People in present day Austria drank beer”, it implies they drank beer recently. “People in present day Austria drank beer 2700 years ago”, while eventually unambiguous that it means the past, still leads the reader on an unnecessary roller coaster of first implying the present and then clarifying it means the past.