Upvote:5
As per the source you mentioned, it is required for all kinds of travel to and from any city to any other city or any region to any other region.
However, for land travel it's not enforced, except in holidays where people are expected to travel in large numbers, some checkpoints are set and they will check it on highways and other intercity roads.
For air and sea travel since they require check-in at some counter, it is enforced and you will have to either proof the booster dose or the antigen test within the last 24 hrs, or the PCR test within the last 72 hrs.
Source: I am currently in Indonesia, and I did travel by land (Jakarta-Bandung-Jakarta) and I am travelling by air in the coming few days. However, I had the booster and I updated my PeduiLindungi app with the vaccination details, no one checked it even though it was holidays, I guess it is random for land travel.