Oooh someone else just posted about something similar. Look for mixed media paper. "Dry media" paper is used for pencils so it may warp if you put down too much ink. Poundage of paper matters for ink. The higher the poundage the thicker the paper. I personally love 98lb paper for ink. Higher is also great. I also like my paper to have some tooth to it, so it's not completely smooth but that's just preference.
Here are my favorites:
https://www.amazon.com/dp/B008NA8768?psc=1&ref=ppx_yo2ov_dt_b_product_details
and this one
Idk why this guy is giving you such a hard time. Lol I feel like it is very common for artist to draw on whatever is available. You should get him a sketch book that has thick paper so if he wants to get use paint or markers it will not bleed through! This is one I bought for myself: https://www.amazon.com/Canson-Heavyweight-Texture-Sizing-Sheets/dp/B0039UMRMW/ref=mp_s_a_1_3?dchild=1&keywords=sketchbook+multimedia&qid=1604329857&sprefix=sketch+book+m&sr=8-3