Haven't read the book but have noticed much less discussion around the four year cycle lately...since perhaps if it continues we are due for imminent depreciation. The fyc is pretty solid in terms of past performance data and the logic of issuance halving but whether or not it will continue is, imo, anyones guess. There certainly seems to be a chorus of people promoting the NGU hopium line that 'its different this time'...

Any present and future discussions of 4 year cycles must include capital flow in/out of bitcoin ETF, possibly the biggest driver of price right now

I posted an article available for download which addresses the current cycle

Let's not fall into this "super cycle" trap again, like 4 years ago :)