Not sure if this is the one but this looks just like the outside of his Thick Classic Notebook with Pen Loop - A5 Wide Ruled Hardcover Writing Notebook with Pocket + Page Dividers Gifts, Banded, Large, 180 Pages, 8.4 x 5.7 in https://www.amazon.com/dp/B07MW2FW8L/ref=cm_sw_r_cp_api_glt_fabc_NV63R13KZHRKGJ458PQQ?_encoding=UTF8&psc=1
Amanda links all of the things she talks about in the description box of her videos. Lemome is sold on Amazon. Not sure what you mean by “nothing came up” on Google...This came up when I googled lemome notebooks.
It's not going to be helpful, I'm afraid, but I just found out that Lemome make a notebook with a pen loop on the spine.