Over the past two weeks, Nintendo's official commemorative website contained an error, mistakenly labeling "The Legend of Zelda: A Link Between Worlds" as a playable title for Nintendo Switch Online (NSO) members.
Reddit user vertexjrpg posted screenshots of the relevant page today. Gaming media verified that as of this morning, the page still displayed the NSO playable label; according to Wayback Machine archives, this error first appeared on November 4—the day the Zelda 40th Anniversary website first added its "History" section. As of today, the incorrect label has been removed. Media outlets have contacted Nintendo regarding this matter and are awaiting an official comment.
Does this error have any special meaning? Most likely not. The most reasonable explanation is that the web developers mistakenly placed a label in the wrong spot; such mistakes are inevitable. However, there's always a slim chance it could be a hint at future plans. With the launch of Switch 2, GameCube and GBA games are now eligible for the NSO library, so the next candidates on the list would naturally be titles from the Wii, Wii U, DS, and 3DS platforms.
Currently, the only legal and official way for players to enjoy games from these platforms is by owning the corresponding physical consoles, paired with physical game cartridges, or digital versions downloaded before the respective online stores shut down. Therefore, it is not easy for Zelda fans, especially newcomers who just got into the series through "Ocarina of Time," to experience masterpieces like "A Link Between Worlds."
I'm not optimistic about 3DS games being added to NSO in the short term, but I believe it's only a matter of time—at least then I'll be able to revisit those Pokémon games I couldn't play before. That is, provided I don't have to subscribe to a third, more expensive membership tier.