I dont know who SHNVA is but happy birthday to him/her i guess
SHNVA is (or was) a prolific Reimu x Yukari artist. They're listed on Dynasty under the name Shinoba.
So did shinova see and or react to the birthday present??
They did! They left the comment "每次累的时候都会觉得很有劲、这个作品是最棒的、谢谢…!"
Sadly this comic/comment was made back in 2019. For whatever reason SHNVA deleted all of their old Reimu x Yukari art on Pixiv, so they may not be a fan of the ship anymore.