the link says "can not be found"!
While it is true that the 2017 bubble was the largest in Bitcoin’s history,
was it really the biggest bubble?
note that being a big bubble is not about being in the highest price but having actual big BUBBLE. I personally consider $10k to $20k a bubble which means it really wasn't that big. in fact it can be considered one of the smallest bubbles. even if you consider current price as the bottom and take the 80% drop as the bubble burst (which it really isn't true) that still doesn't make it the "biggest" because we have had bigger bubbles in the past.
the market capitalisation of both Bitcoin and the cryptoasset ecosystem still exceeds its January 2017 levels –-
I am sure this will happen for bitcoin but it will not happen for at least 80% of the altcoins and the rest of 20% will have an extremely hard time to reach their previous ATH because most of them have already lost their place in the market and are being replaced by newer altcoins.