I remain unconvinced of the practical applications of solutions like this.
These seem like academic toys.
Pre-processing a dynamic database is a non-starter. No database that is used for any real world use case is static at scale, especially not internet traffic.
I’m not expecting FHE that’s fast in my lifetime, but I’ve been wrong before.
Context: I led a team which built the first open source production-grade implementation of hardware-accelerated PIR which is currently at use at scale.