New to all of this and thinking of booking a high end girl for my first time. She has a no review policy and appears to be delisted on here (google search shows but clicking shows it’s been removed). Is it safe to assume that if the provider had bad reviews for being a scammer or something that the provider couldn’t request those negative reviews be removed? I’m like 99.9% sure everything is fine but of course there’s a tiny seed of be careful.

Women request to be delisted for a variety of reasons.  I know some that have delisted themselves, but they had good reviews.  One I saw was a Top 10 TER Provider but went UTR.  Don't assume the worst.  

and then attempt to get back on with a new name, IP address, etc.

Why what? I'm not sure what you're asking him to explain.

Agree. Maybe OP should provide the name of the escort in question and maybe someone here would know why she delisted and/or whether she had a history of bad reviews.

First, as others have said, you likely have a number of other options available to you and if you're new it would be advisable to go with providers you can get reasonable informantion by researching them before making a decision. Pretty much all the ads you're going to see will be about generating interest - some will be more ad while others will be more information content. You don't really know until you dig deeply and then confirm first hand. So if you're being attracted by some shiny object, as it were, I suggest putting that on hold. If she is really legitimate she will be around "tomorrow" to see so you're not missing out on anything.

A lot of high end ladies have a no-review policy.  
I knew several when I was actively working 10 years ago and they had plenty of clients. You will be rolling the dice to some degree because you have no idea what she is into and what she’s not into. Generally, if they are not hiding anything, you’ll find some discussion about them somewhere…

Yes curious what you are asking why about. Why am I nervous? I suppose it's just the first time jitters, giving out screening info, etc. Since posting that I did learn that tryst screens people though to make sure they are really them, so that makes me feel way better about the person being a scam artist who isn't real and then extorts you for money to prevent revealing things. That concern is gone for me now that I know Tryst does that.

in a financial position to pay for your mistakes in cash, go with your gut, even though most mongers, including me, would never take a chance on a girl with no reviews no matter how high her end is.  

Which of these concerns would you say is a bigger contributor to not wanting to see these types:  
A) They are not like their pictures/are a scam artist
B) They don't provide services you expect (standard expectation eg CFS) or in a way expected (not good)
C) They don't provide services you want (eg BBBJ)

Yes!

when there are no reviews to give you insight and guidance on what to expect.  There have been many mongers here who have started threads on the topics of your ABC list.  Review content is the best way to check off these items before you book your session, or God forbid, send a deposit.