I find tamarind to be an unfriendly ingredient when used in recipes unless the recipe describes it's use from scratch, ie, from a block of whole tamarind pulp with seeds. This used to be the only way I could obtain it and the process usually involved soaking and straining to obtain tamarind water which was then used in the dish as directed.
There are now many different products available and they mostly have no description on the package of what you have or how it should be used. I think it is very important in this instance to observe the advise provided by SS in relation to the sugar content of the tamarind sauce used in Romain's recipe.