"I often wonder about the WT goons whose job it is to actually view this kind of content , trawling Youtube to find examples of transgressions. Are they so far conditioned that they can just view it without in any way being affected or waking up?"
Yes they are. Back in the day, I knew of a retired Circuit Overseer then pretty old whose job at Bethel was to sit and read newspapers and report back anything of interest . I bet nowadas they search Youtube and other sites. These oldies are unreachable.
This action really does seem petty.Those Lego videos are gently satirical not nasty . The "fair use" of copyright material seems to be a grey area. Perhaps this is a test case?