No, Scalise really is a swamp rat from Louisiana.
If you mean the dude from Belleville, he appears to have been for real. His congressman says he's never met him F2F but has had maybe ten calls from him over the past year, an angry but not threatening voter.
Not sure I believe the congressman since he hasn't been answering his phone for the last few months. But the cops in Belleville say he's got a DV record and has been active in demonstrations and stuff for a couple of years. More will be revealed, I guess.