@Troy I see what you mean. I'm not sure if the issue is on Alteryx's side or the pdf reader side. My bet is on Alteryx. It looks like it only affects pdfs (things seemed fine if I rendered to html or word). I also tried a different font (Times New Roman) and that one exhibit same issue of turning italics into bold italics. I tried various readers and they all displayed it as bold italics.
It's not ideal, but what if you picked a font that didn't have bold italics as an option? I saw Californian FB and Franklin Gothic Book as I was scrolling through.