Any plans on releasing mods for the Demo that released this week?
trainers aren’t typically made for a demo.
Welcome back to the community. 
Demo versions of games don’t typically receive trainers, no.
Demos are typically temporary (and likely extremely buggy) and therefore a waste of WeMod’s time and resources creating and maintaining a trainer for it, as well as a waste of space on WeMod’s servers storing it.
Demos don’t represent the final version of the game either, the coding between the two are likely to be very different, so it’s not likely a trainer for a demo can be “updated” to work with the full release later.
While there have been perhaps a couple of trainers for demo versions of games in the past, those trainers are now dead since the demos no longer exist. I think WeMod wants to avoid filling its library with dead trainers, to be honest.