No, this is short cake ...
“She explained how she ordered the 3/4 inch sheet cake online through Publix.”
That’s a short cake.
I’m not a baker, but think the “inch” should be omitted from that sentence.
No, this is short cake ...
Or a thick cookie.
Sheet cake is a real thing.
Everyone misunderstands the word “shortcake.” Our local diner has a huge cake with white icing and strawberries which they call “strawberry shortcake,” presumably because it has strawberries.
Shortcake a very small biscuit-type cake that you can make the classic dessert out of.