I think it’s reasonable to at least ask him to post in dark enough colors that we can read it. It’s hard enough to pay attention and moderate long, rambling posts. We can’t have him posting inappropriate stuff that we can’t easily read though, and have that get sucked up by search engines.
I’ll send him a PM about the white text.
I also went and removed the white color code on one of the messages in his introduction. It’s default black now.