12
I went to a virtual influencer's [Calli's] sold-out concert and the fan base was unlike anything I'd seen
(www.businessinsider.com)
Community dedicated to discussing the Japanese Vtuber group Hololive!
Rules:
But she's not "just" a music creator, she's also a streamer and those with larger audiences are "influencers", whether intentionally or not. Besides, for many people it's just a label used for popular social media creators in general.
I don't disagree author could've used a better language but that would require more familiarity with the topic and based on the article it does seem like all of this is pretty new to her (both VTubbing and JP-style fandom).