Conflict of interest is totally separate from the reliability of sources issue. I think the thing that would be encouraged in this situation is to detail what you would want changed on the talk page, and have a neutral wikipedian look at it and make the changes if appropriate. See also https://en.wikipedia.org/wiki/Wikipedia:Plain_and_simple_con...

That said, as far as where the line is drawn for sources see https://en.wikipedia.org/wiki/Wikipedia:Reliable_sources i dont think forum posts are usually considered the best sources.