Is it? I thought it was regular Reimu, she's in panels 8,9,12,13,14,16, and a couple more. It makes little sence to switch to yukkuri for one panel. Also, she has a non deformed face, and there may be two pixels of her neck visible.
The yukkuri refference I see is panel 28 (aka 11th from the end), the mummy is holding a sign that says yukkuri[something]. Also in panel 17 there is a sign with typical yukkuri word bubble with "spikes", but it's unreadable, I'm not sure about this one because it says something about generator above that...