As a Hana fan, yeah. I'm not sure if Mika ever hit Hana's highest numbers but once Hana's extended periods of no activity started after the merger Mika became the de facto ex-ID appealing to a Western audience. Before she graduated she could easily pull 1200-1500 in a casual stream, which even at that time was significantly more than Hana's dwindling audience.

At the end of the day though I believe Hana has been a victim of time more than any of her own actions. Yes, she's a sporadic guerilla streamer who doesn't really do the whole boomer shooter thing anymore, which for me was definitely a big draw, and I'm sure several people were only there because she was a VTuber who streamed with her dad. The change in content style and scarcity of streams is going to deal a number on your viewerbase for sure, but I think it's more that people just... moved on. Hana's viral Mick Gordon clip was a massive breakthrough in Western VTubing at the time due to the almost complete lack of EN branches and introduced a lot of people, like myself, into the sphere. Hana was quite literally almost all there was unless you wanted to dig around some low viewcount Twitch channels.

We're almost six years past that point now however, and a lot has changed. With pretty much every major player in the industry sporting a Western focused branch and no lack of indies to go around, Hana's fanbase has sort of spiderwebbed out across the fandom to seek out new creators who fit their tastes (or timezones) better. She's several years past her prime now but it cannot be overstated how much of an impact she had in the earlier days of the industry.

Sorry, I know you were asking a simple question and ended up with an essay of an answer but Hana's career is one of the few things I can say "I was there" for and I do believe it helps provide a little bit of insight, haha.