How does it disregard multi-core performance? As you said, it's showing the transistor counts going up, and it's also showing the rise in the number of logical cores.
The missing thing that's critical for most multi-core performance use cases is memory bandwidth. Maybe not easy to summarize on a graph like this, but for any workload that can't fit within L1 cache, you're unlikely to get close to linear performance scaling with cores. Sometimes a single core can fully saturate the available memory bandwidth.