Nope. He explicitly only praises battery life in that parapgraph. He experienced some performance issues in his (old) test device:

Ubuntu Touch shines in battery life (at least in my experience). Since the OS is lighter and uses fewer system resources, many users report better battery performance than on Android. Ubuntu Touch is optimized to reduce unnecessary background processes, making your phone last longer on a single charge. However, if you push the OS with more demanding tasks, you may still run into performance issues, especially on older hardware.