In my opinion it's a mistake to start that chart so early, the network had crazy volatility in block times and hashrate back then because it was so small. Effectively the Bitcoin engine was just getting started and took a few years to get it's flow.

Starting the observations when things stabilized, right around the 2013 bull cycle; tracking the bottoms since then, adjusting for global macro events, appears to make a much more reliable trend line measurement and projection IMO. I've made posts with more details on my page if any of y'all want to know more.

My observations show were right on the bottom trend line, it has just fallen due to events in 2020/2021. Not crazy times, just normal times. Those paying attention benefit, those too distracted by the FIAT world continue to ignore it.