1. Pease has some good points to make about the use of fuzzy logic in control systems (e.g., difficult to prove robustness of nonlinear models) but it appears that he never stopped criticizing long enough to really find out what fuzzy logic was and the advantages it might bring (e.g., nonlinear control systems, use of human intuitive knowledge in control systems).
Nonetheless Pease is funny reading and his writings likely contributed to slow US adoption of fuzzy logic control systems. As a result of this (and the unfortunate literal minterpretations of the term itself perhaps) fuzzy logic control systems in steadicams, helicopter guidance, subway control systems, rice cookers, washing machines, etc. that we use today mostly originate from abroad. .
2. I've never read/heard the term "Multivariate Logic" used as a synonym for fuzzy logic.