DWDS is just plain wrong. anreisen does not specify the means of transportation at all, it could be by car, by rail, plane or ferry. It does imply a longer journey however, you wouldn't use it eg for a trip inside the same city.

The focus of anreisen is on reaching the destination, so it would be rather odd to apply it eg to travelling on a cruiseship, where the trip itself is more important than being transported to a destination. The destination also needs to be already in focus, ie if we take about Biden in the US, we can't suddenly take about how he "reist an" to Germany.

DWDS is just plain wrong. anreisen does not specify the means of transportation at all, it could be by car, by rail, plane or ferry. It does imply a longer journey however, you wouldn't use it eg for a trip inside the same city.

The focus of anreisen is on reaching the destination, so it would be rather odd to apply it eg to travelling on a cruiseship, where the trip itself is more important than being transported to a destination. The destination also needs to be already in focus, ie if we talk about Biden in the US, we can't suddenly talk about how he "reist an" to Germany.