What happened at the event
ESL's July 20, 2021 review confirmed that Natus Vincere defeated G2 Esports in a 3–0 grand-final sweep on July 18. It described the competition as the first LAN in more than 500 days, returning teams to an in-person Counter-Strike setting after a long interruption.
LAN describes players competing through a local event network and shared physical venue arrangements. It does not, by itself, establish that a stadium was open to a large public audience. An in-person competition and a ticketed spectator event are different organizational questions.
Source [1]How to read the final score
A 3–0 series score means three maps were won by one side, rather than three rounds in an individual map. The organizer's account also identified s1mple as the tournament's DHL MVP and listed a US$1 million prize pool. The total pool is money across the competition, not automatically the amount paid to one player.
The 2021 event is complete. Old announcements about dates or tickets should not be treated as current booking information. For another milestone in the competition's history, the linked Rio article explains the 2022 Major in Brazil and its separate championship result.
Source [1]