Not all 90's inserts are created equal. Some dazzle, some sparkle and some just fall flat. There aren't too many that fall flat but today's Rodney's Cardboard is one I would put in that category in terms of mind blowing cards.
1996 Playoff Prime had an insert called, Metal XL that fell at a rate of 1:80 packs. So it wasn't an easy find. But, it's pretty bland when it comes to what you expect out of a 90's insert.
This insert looks more of a base card to me than insert. There was a few of those that did in the 90's but not as often as they do today.
I am not sure what sense the insert is either, usually the XL means a larger card or larger size. At least for me and my shirts and pants. But, it doesn't really pertain to this normal piece of cardboard. Oh well, as I said already in this article, can't always be winners.