I don’t think FTX is the right contrast here. This document is mostly about business realism: revenue, margins, etc.
VCs did get burned by speculative investing in the 2019-21 period but FTX wasn’t like the others. At the time of its collapse, FTX was profitable and had $1+ bn in revenue, its doom had nothing to do with product market fit, revenue, margins, etc.
Quibi might be a more relevant example of a learning opportunity.