You are free to believe which casino's review, he is simply suggesting you something good, you can do simple search with keyword "trustpilot" in this gambling board and you will see that most experienced gamblers will not use it as a reference because anyone can post a review there without providing any proof.
For your pending withdrawal, how much is it and what they told you about the case? I'm sure there is a communication between you and the support, there must be a reason why your withdrawal is still pending.
You are also free to open scam accusation against shuffle in this forum if you think that there is something wrong with your case, but dont forget to bring all your evidences to support your accusation.
Also i want to add that while it attract all the crazies venting their frustration, it's also used by companies that sell good reviews for money, as well as bad reviews for companies that didn't pay or are payed to fud at.
You can google for such services / jobs for writing and they are seemingly growing section of marketing. I am not sure how common bought bad reviews are, or if they are even necessary as every casino have some angry banned ex users. Those aren't however red flag, as when the casino starts scamming people, it's going to be be affecting way more users coming yelling online, then one rando saying they have been targeted because of region.