Now you could allways make some server mod so the server sends false data to the client which doesn't recive the actual build but just maybe some random spam instead techiaclly that is possible. not though if they make a client mod that saves the bricks of what the server sends on join, if now the server/client communication works as im guessing it does.
so yes it should work as long as someone doesn't mod the client to save it manually.
If they don't save events or ownership, saving is entirely client-sided.
But, if they save events or ownership, the server will send them the bricks too.
So, in theory, you could make a mod that will make players who save events or ownership save a giant troll face pixelart instead of your build.