The German article cites looks to be talking about Sahra Wagenknecht and BSW, but I guess they’re talking in the context of Die Linke
For the left, it looked gloomy for a long time: constant dispute with the former party icon Sahra Wagenknecht, poll figures in the basement, elections in the east. But now the party is experiencing a small comeback shortly before the federal election – at least measured in concrete membership numbers. The left currently has more than 81,000 party members. This is shown by figures that are available to SPIEGEL.
Headline is wrong, BSW is not The Left. The article is about The Left
The German article cites looks to be talking about Sahra Wagenknecht and BSW, but I guess they’re talking in the context of Die Linke
https://www.spiegel.de/politik/deutschland/die-linke-erreicht-15-jahres-hoch-bei-mitgliederzahl-a-e5c793f0-d6c1-49f8-b8bb-c0284a68295b