They are aware. Much the same effort is going on, quietly, here in Wisconsin. The Democrats are very aware its happening, very much dislike it, but... can't really do anything about it.
That kind of mass training effort requires two things.
1: Volunteers.
2: Money
You need the volunteers to take the classes, sign up for the positions, put their name on the papers, and take time out of their days to do it. The Democrats don't have anyone who can fill out those roles in any sort of numbers. Their most hardcore supporters who are young and could sign up are either A: LAzy as fuck and don't want to do more effort than a retweet or; B: Antifa types who really, really want to maintain anonymity.
And money? They are flat broke for anything that isn't immediately, terribly important. While I can't talk specifics for Wisconsin, just look at somewhere else this is happening. Arizona. Massive push for new poll watchers there, funded both by the state and federal level Republican parties. And the Democrat response? Nothing, The federal side can't subsidise it because they spent far too much and have yet to recoup anything from the 2020 election. State side spent far too much battling the election probe and securing their own asses, and also paid a lot for 2020.
They have no men or money, and now that they -need- it, they deeply regret it.