In the other question, the OP had posted a screenshot (circa 2010) from Transunion with suggestions on how to improve the OP's credit score. One of these suggestions was to obtain "retail revolving accounts." By this, they are referring to credit accounts from a particular retail store. Stores have been offering credit accounts for many years, and today, this usually takes the form of a store credit card. The credit card does not have the Visa or MasterCard logo on it, and is only valid at that particular store. (For example, Target has their own credit card that only works at Target stores.) The "revolving" part simply means that it is an open account that you can continue to make new charges and pay off, as opposed to a fixed retail financing loan (such as you might get at a high-end furniture store, where you obtain a loan for a single piece of furniture, and when it is paid off, the account is closed).
The formula for credit scores are proprietary secrets. However, I haven't read anything that indicates that a store credit card helps your credit score more than a standard credit card. I suspect that Transunion was offering this tip in an attempt to give the consumer more ideas of how to add credit cards to their account that the consumer might not have thought of. But it is possible that buried deep in the credit score formula, there is something in there that gives you a higher score if you have a store credit card.
As an aside, the OP in the other question had a credit score of 766 and was trying to make it higher. In my opinion, this is pointless. Remember that the financial services industry has an incentive to sell you as much debt as possible, and so all of their advice will point to you getting more credit accounts and getting more in debt.