The inaccuracy of this comic is that there's been multiple classic timelines.

2019 - WoW Classic Vanilla release - Timeline 1
2021 - WoW Classic Burning Crusade - Timeline 2 - transferring from Vanilla to TBC was optional
2021 - WoW Season of Mastery Vanilla - Timeline 3
2022 - WoW Classic Wrath of the Lich King - Timeline 2 - all character on TBC were advanced to WotLK
2023 - WoW Hardcore Vanilla - Timeline 4 - your character gets deleted if you die in this version
2023 - WoW Season of Discovery - Timeline 5 - this was a different version of vanilla where character levels were capped below 60 and had converted the original vanilla dungeons into 10m raids
2024 - WoW "Fresh" Vanilla - Timeline 6 - this was meant to be a repeat of the 2019 release
2024 - WoW Classic Cataclysm - Timeline 2
2025 - WoW Classic Mist of Pandaria - Timeline 2
2026 - WoW "Fresh" Burning Crusade - Timeline 6

WoW forever will be the 7th? release of Vanilla.