I can fix that for you in 5 min worth of effort. Take the laces out so you can access as much of the inside of the shoe as possible. Remove the insoles. See the two little dark circles in the strobel, one in the heel and one in the forefoot? Take a can of WD40, line the tip of the straw up to each one of those holes (they aren't actually holes on this pair) and press it flat up against them, and give a short squirt. Just enough so you see a bit of WD40 spread around that same area in the strobel. I also gave a very short squirt to the edges of the forefoot and heel, both sides. Shake your shoe around a bit for 10 seconds, let 'em air out for awhile, and that's that.
I had to do this to my first pair of these IEs after less than two weeks of wear after they released. Haven't made a squeak since. Have had to do this on multiple XIs, it's just something about the way they make the midsoles. It haunted me for years till someone else on here suggested the WD40 and I tried it on a pair of my squeaking Navy Snake XI lows. I was skeptical but I'll be damned if it doesn't work every time. I did have to redo it with a small amount once or twice on my Navys, but still no big deal.
Someone also said to be careful with this because WD40 can break down glue, but I haven't had a problem with that. I think you'd have to really use a lot, and I'm just using a little bit. That said, something like a dry graphite spray lube might work just as well. I just haven't gotten around to picking some up but I plan to try it the next time I bust out some DS XIs and they start squeaking.
Either way, the squeaking on XIs is something that no longer concerns me. It is now a thing of the past LOL