These are definitely interesting, but I have to question what they're actually showing. If /pcg/ actually mattered that much to Phase's numbers as a demographic, I would expect to see a more significant drop from 2023 to 2024 in Gen 1's sales or viewership/membership numbers, for example. Maybe the newer girls are cannibalizing the support of more hardcore Phase fans from their senpai? And it doesn't matter because more established members like Tenma or Airi have been able to establish their own fanbase over time?
Also may be that respondents from 2023 have stopped reading /vt/ but have continued watching their favorite Phase members, in which case these might be a better indicator of how the /pcg/ population has changed in the last year. Interesting to look at either way, though.
Also I feel bad for Loki, she is cute and deserves more love.