We're referring more to the "data platform" part. What we mean by a "Postgres data platform" (and arguably it's not an widely accepted term, so take it with a grain of salt) is that you get not only Postgres, but secondary data stores around it, more tightly integrated than in a typical cloud provider:

- Elasticsearch, to which we replicate data automatically via CDC

- Blob storage for file attachments, we use S3 to store the files and Cloudflare to cache them on CDN

- (in the future) Caching

- (in the future) Time-series databases, again with automatic replication from Postgres

That said, you can use just the Postgres part, and we are very happy if you do.