Yup I'm sure and I've gone back to the books to reconfirm.
In Piolas case at the begining of each book he has a chapter called "Chassis History" where there is a list of all the monocoques constructed by each team, in which race they were used by which driver and each monocoques reference number. Later on in the crash test section he constantly uses the word chassis to talk of the monocoque.
In Macknights books he has a chapter called Chassis and in this chapter he goes through all the monocoque procedures of fabrication, from CAD going to machining the patern using UREOL, then to carbon fibre...autoclave...then the construction of the monocoque.
In Wrights book he refers the monocoque as chassis constantly.
And here are some lines from the Formula Student/SAE competition, where the call a car as a monocoque chassis:
"F) On all monocoque chassis, the main hoop(...)"
"-Braces attached to monocoque chassis must be(...)"
"(F) All monocoque chassis (composite monocoque or metal
monocoque) must provide the same protection as tube frames (=space frames)
built per Section 3.3.3.(...)"