You miss my point. It's not replacing Postgres' entire block storage with FoundationDB, it's injecting Table Access Methods and Index Access Methods handlers to override tuple storage at the table and index level. These handlers deal with tuples, not blocks.
The author replied to this thread and confirmed this.
Comments
So this is wrong. The heap storage is replaced.
You miss my point. It's not replacing Postgres' entire block storage with FoundationDB, it's injecting Table Access Methods and Index Access Methods handlers to override tuple storage at the table and index level. These handlers deal with tuples, not blocks.
The author replied to this thread and confirmed this.