That's not complaining about the relational model at all, he's complaining about implementation details of common RDBMSes being obsolete, as they're based on row-oriented storage, slow disks, small memory, and limited concurrency.

Things like Amazon Redshift are still relational but make radically different decisions on most of those points.

Edit: that talk is well worth reading, btw. I wonder why he completely ignores flash though?