I posted a thread about a provider I was interested in seeing and got the following message:
Reason: Your post contains a reference to a delisted / banned provider which is not allowed per TER board posting policies.

Should I be concerned?

It's hard to know the reason why. Delisted can mean she decided to have her reviews removed. That could be for many good reasons. She could have a stalker, an upcoming child custody case or any number of reasons. Banned is another reason altogether.  She could be a trouble maker, submitted false reviews of herself etc.  My advice, just move on and find a provider with great reviews. Good luck.  In the future, if you're inteested in back channeling about a provider, send a pm to a hobbysits whose seen her recently.  Discussions about providers are much better done in private, even though public discussion does have it's place at times.

While all reviews are subjective, I've found TER to be more reliable than sources where the ladies pay for the site.  
You might ask her if she has reviews somewhere else or research on your own.   There's no way to determine why a provider was de-listed.

In my newbie days, I also tried to post a question about someone whose profile was also unavailable. This was one of THE most beautiful stunners I had ever seen in an ad on Eros, CV or where ever it was she advertised. As you also found out, "Your post contains a reference to a delisted / banned provider"

I googled and searched the web and eventually came to the conclusion that this was someone who was TS but advertised and operated as F and even denied being TS. Some reviewers (non-TER review sites) said good, even great, things but there were the usual complaints about being misled. I don't know TER policy, but I think that might be why she was banned or delisted or why she chose to be delisted (didn't want to have to be listed as TS contrary to her ads and assurances).