I can't corroborate this, but another simmer said she deleted the tmp files but then had missing content. When she restarted the game, she got a notice that there was a Store patch and when she accepted she had tmp files back (although from what I am reading in this thread, it sounds like they could have been generated from using the launcher and not some kind of patch at all).
I patched last night but did not start with the launcher and I have no tmp files. I have so much Store content I'm not sure I would even notice if something was missing. I'll try to check that today. :?