The point there was that - because of the institutional investors and maybe too because Bitcoin markets become more mature with every passing year - the highs should no longer be so spectacular, and the lows too should no longer be so depressing. So one idea was back then that maybe what was in April was a weak crypto winter (more like an autumn than a winter) and maybe in the next cycles it'll be even softer.
In this winter, we have already lost 70% of the value. I also read opinions that this time the correction will not exceed 55% and will stop at around 28-30k and that bitcoin will never cost lower. Institutional investors are fine, but don't forget about retailers and derivatives products, whose volumes are constantly growing, and derivatives products are very often catalysts for large bitcoin dumps, because traders begin to actively use borrowed funds.