The site is perfectly fine, properly moderated and has nothing to do with phishing.
Propellerheads often refers to reasontalk.com as you can see here:
Best answer by s l i g h t
or the Reporting Scams form
(Orange buttons on bottom of either page)
.... obviously making it clear that it isn't a scam or fake activity.
In the window for URL you are reporting I'd put the exit.sc link to reasontalk that is in your post, and put the regular reasontalk URL in the report.
How did you come across the link in the first place?