Correct. With the current setup, there will be one platinum battleground and there will probably be four guilds pulled from the gold league to participate in that platinum battleground.
To compensate for this "added challenge", the guilds from the gold league (in this particular scenario) can climb the leagues even quicker if they win, and at the same time, it's less likely for them to drop in league if they lose. Basically they get what we call the "underdog bonus".
Your guild is not really in Platinum League currently, so yes that's correct. You are playing there, solely because your guild (and a few others) has been pulled up from Gold League to play in the Platinum League battleground. The ranking and city data would update if your guild reaches the Platinum League normally (without being exclusively added to it during the matchmaking process, because of lack of Platinum guilds).Yes, we have KYP on our map.
And... The guilds marked with arrows in the screenshot are on the same map, but listed in different leagues. We are in Platinum league, but the statue tooltip in the city says "gold league" - NOT A BUG?? Really???
Your guild is not really in Platinum League currently, so yes that's correct. You are playing there, solely because your guild (and a few others) has been pulled up from Gold League to play in the Platinum League battleground. The ranking and city data would update if your guild reaches the Platinum League normally (without being exclusively added to it during the matchmaking process, because of lack of Platinum guilds).