Yes, you are indeed correct. I do want to let you know that PRO is not required to sell tickets. In other words, you can sell tickets with just The Events Calendar and WooCommerce Tickets alone.
You can totally get PRO too if you want the additional features it offers (recurring events, additional fields, extra calendar views), but you won’t need those specifically for tickets. 🙂
Does this help answer your question? Please let me know.