^ I think it's her. Besides the moles and the body type, if you watch enough of her videos, you can catch enough accidental quarter-profiles when she bends down into shot that you should be able to form a mental composite of her.
Also, she reads and replies to the comments on her videos, and a lot of those comments playfully hint at her true identity, so as the saying goes: she is neither confirming nor denying it. <wink, wink>
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A two-disc set for Sayumi Michishige's 31st birthday event…
https://www.elineupmall.com/c725/c1727/8-dvd2020-nefpvq02/
It's weirdly quiet because the event was held back in July when the heavier restrictions (e.g., reduced capacity, no cheering) were still in effect.