The release-day announcement
Universal Music Canada's September 10, 2021 announcement identified LALISA as Lisa's debut solo release through YG Entertainment and Interscope. It announced her solo late-night television debut on NBC's Tonight Show Starring Jimmy Fallon that evening. Those details locate the performance in the release campaign, rather than indicating a new upcoming booking today.
Source [1]Group membership and solo work
A performer can have both a group identity and an individual release. The words solo debut describe the project and billing; they are not, by themselves, a statement that the group has ended or that every later activity will be solo. BTS's 2022 announcement provides another example of why those distinctions matter.
When revisiting a music performance, separate the recording's release date, the television broadcast and later clips uploaded online. They may refer to the same promotion without sharing a publication timestamp. This article preserves the original announcement and links to current Music coverage for later releases.
Source [1]