I always suspected that. It is easy to make and the materials are plentiful. We saw a lot of plaster in some of the Qumran Caves, although we really couldn’t figure out their use. They might have been strictly for preservation, but our estimate of when they were made were about 2000 years, which would have been contemporary Roman. I found Roman artifacts in the material they used for making small dams, on their way to Metzada, but it is so plentiful that it could have predated perhaps even pottery time. We found it with Chalcolithic artifacts, so it is possible that it went back a few millenia from that. In any occupation, you have to figure out the abundance of the materials and the need for it. They were always near water sources.
The use of two different kilns for different kinds of rendering struck me. Lime kilns were used by the Romans and in the aftermath (middle ages) of the Empire to destroy lots of Roman statuary via the lime kiln. Destroying statues isn’t new, and neither is the destruction of culture by invaders.