Depends. Many would say "yes." As for who puts it out, I can't think of too many artists or labels that put out "acidcore" consistantly. Drop Bass Network is one label that springs to mind which put out some stuff some would consider acidcore. DJ Freak has done some tracks I'd consider acidcore. Senical is another. Laura Grabb as well. It resembles "hardcore" a bit more because the kick drums are usually run through the same amount of messy distortion as the 303s. And this isn't a new subgenre term either. It's been batted around for a long as I can remember. Here's one that I did that has been called "acidcore." Can't say I'd disagree.
http://www.acidgrave.com/tocsin-bring_the_war_home.mp3