"248 yuan ship ticket + Guangzhou Tower, meaning it's a combination of tickets for the boat and to enter Guangzhou Tower, two tickets?"

Yes. The Guangzhou Tower 248-yuan combined ticket includes Guangzhou Tower’s White Cloud Starlight show + Pearl River Night Cruise ticket. Helps you, please click the green “Agree” button.
Yes. The 248 yuan joint ticket for Guangzhou Tower includes tickets to Baiyun Star Sky Observatory and Pearl River Night Cruise. Help you, please click “Confirmed” in green color.