As Tim mentions in the thread I linked, Banana RTD is very different from Banana powder. The flavour of RTD is similar to other banana milkshakes (yazoo, frijj, McDonalds banana milkshake etc), and other banana flavoured sweets. There’s a number of really good reasons that none of these things taste like the actual bananas that we buy in supermarkets these days, but long story short it’s because the “banana flavour” compound is based on a cultivar of banana that no longer exists (sad times, I wish I could bite into a fruit and taste that amazing banana milkshake flavour a la gros michel).
Anyway all that is to say, Banana RTD Huel tastes like most “banana flavoured” sweet things (delicious), and Banana Huel powder tastes more like real bananas, less sweet, more “chalky” to my taste, but just as great (especially with a banana thrown in and blended in my experience).