You are correct in that that appears to be the main point of the article. However, the analogy is unfair.

Airports are in relative short supply, so once you've taken the train, your stuck on it for quite a bit.

Migrating away from an ORM or using raw sql queries in addition to an ORM is possible at all times (with more or less work, depending on the ORM you've chosen). So you can start with the train and hop on the plane anytime you want or need.