I think messaging the service rep was a good idea, hopefully they get back too you soon with a definitive answer. Also, don't feel silly contacting them, if the layout you saw was the reason you chose the a Premium studio than better to figure it out now than have to deal with potential issues when you arrive.
We also found that finding "accurate" room layouts to the suites/studios difficult in the past. Between the differences in rooms between the Swan and the Dolphin and renovations every couple years, I'm not sure if they have one specific layout.
We stayed in Executive Suites at the Dolphin, in 2011 and 2013, and the room layouts were definitely not the same. Luckily both rooms worked out great for us and we prefered certain aspects of both of them. In 2011 the room portion was a handicap accessible room, so it had a wetbar/kitchenette area and walk in closet. In 2013 the wet bar/kitchenette was in the suite room (my room) and the room was a standard room. Funny story, we really liked the wetbar/kitchenette area on our second stay and wished we had one on our first stay. 2 or 3 days into that stay we realized that we did have one on our first stay, but that was where we kept my nieces crib, so we were not able to use it.
Sadly, because of the Dolphin renovations, no executive suites were available for our stay in June, so we had to book at another resort this year. Not looking forward to staying at a value resort this summer because I think those executive suites really spoiled us.