yes
it would only be accurate, when one looks at BOTH the CPU and the microcode. The Xerox Interlisp-D machine was a Lisp Machine with the specific microcode. It was a Smalltalk machine and a Mesa machine - each with their microcode.
The original MIT Lisp machine was also microcoded, though I don't know other Microcode than the one for Lisp. The early Symbolics Lisp Machines were also microcoded, but again only for the Lisp OS, with the microcode evolving over time to support features of Common Lisp, Prolog and CLOS.
There were complaints that the Microcode on the Lisp Machines was very complex, which contributed to the death of the machines. For example here is an interview with Keith Diefendorff, who was also architect for the TI Explorer Lisp Machine. In his interview he talks about the Explorer Project and the Microcode topic: https://www.youtube.com/watch?v=9la7398ruXQ