Nah he is right, every halvening is less important then the previous.
LOL, there has only been 2 halvings so far. With this small of a data set, we're speaking in the realm of coincidence, not reliable patterns.
In hindsight, we may find this entire first decade of price discovery was essentially
noise before the vertical swing of an S-curve. I would be weary of assuming the past cycles will automatically extrapolate into the future. The trend could reverse, or the magnitude could increase (or decrease) even by orders of magnitude.
The people planning to sell at $60K-$100K because they insist BTC must follow the past logarithmic trend (with diminishing gains) may end up selling way too early.
You are talking about the logistic function, a model of growth which starts as purely exponential and then transitions to a saturation regime.
The sigmoid shape appears when you draw the logistic function on a
linear graph. A
log graph of the logistic function doesn't have an s-shape.
The early growth appears as an upward curve on a linear chart (like the one you posted), but looks like a straight line on a log chart.
When saturation effects begin damping the growth rate, the linear graph exhibits an inflection point (as on your graph).
On a log graph, the transition to a saturation regime appears as a downward bend from the inital straight-line exponential growth, subsequently approaching a horizontal asymptote.
The logistic function can be expressed as y=1/(1+e^-x), and here is the log graph
https://www.wolframalpha.com/input/?i=y%3Dlog%281%2F%281%2Be%5E%28-x%29%29%29%2C-10%3C%3Dx%3C%3D10%2C-10%3C%3Dy%3C%3D1TLDR: we won't see a sigmoid on the log chart of bitcoin's exchange rate history