that tweet only proves they know the game has bugs and they will release a patch to fix it. But since the game is top 5 in steam, they would be stupid to not sell more dlc to us. Plus alot of us want more dlc.
Steam "top x" lists aren't very useful. Since Civ is a Steam exclusive, it has an advantage over other PC games. It doesn't factor in people playing in offline mode. Multi-platform games aren't very well represented either since Steam doesn't track all console games.