I would have to disagree.
To call anyone any kind of
“artist” is to suggest that he has some significant and meaningful talent in that art.
A
“bullshit artist”, I would have to say, would be someone who is good at telling lies, and getting people to believe them. It would imply a significant talent in producing well-crafted lies that demonstrate a significant degree of cleverness and creativity.
Slade3200 is indeed a prolific liar, but not in a way that suggests any such cleverness, creativity, or talent.