Is that info up-to-date? Their readme states:

  **Backup types**
  
  - **Logical** — Native dump of the database in its engine-specific binary format. Compressed and streamed directly to storage with no intermediate files
  - **Physical** — File-level copy of the entire database cluster. Faster backup and restore for large datasets compared to logical dumps
  - **Incremental** — Physical base backup combined with continuous WAL segment archiving. **Enables Point-in-time recovery (PITR)** — restore to any second between backups. Designed for disaster recovery and near-zero data loss requirements

https://github.com/databasus/databasus/issues/411