I mostly ask for it as Coke No Sugar, even though I’m sure if I asked for Zero they’d know what I’m asking for - but it just avoids any doubt or having to be asked if No Sugar is okay instead. I wouldn’t want to accidentally get Diet Coke instead.
Something I noticed on the bottle for that Raspberry Coke - that says it is a ‘25% less sugar’ version, with it having both sugar and ‘sweeteners’ - wonder why they’d be trying that, rather than just be Raspberry in the No Sugar coke, like the Coffee one was.