>>280849663
No, it's by "siji-nii" (しじ兄). I'm not sure if he even uploaded his stuff outside of... niconico? I'm not sure how I even found the guy.

https://seiga.nicovideo.jp/seiga/im1265172
https://seiga.nicovideo.jp/user/illust/14432033

The last time he uploaded was in 2019, although it's possible he just swapped platforms.