1st, I have noted no harm from human urine smell when deer hunting, and plainly pee near my stands. 2nd, I have urinated in scrapes and had 'em torn to heck the next day. 3rd, I rarely hunt over scrapes so don't "freshen" scapes where I hunt.
Lastly, a tale: I once co-owned a section of land, I leased 200A of it to some friends to hunt. Knowing they were coming to look at it one day, I made a large mock scrape, with rubs & "licking branch" near a trail I knew they'd be on. I rubbed "tine marks" all over the tree with my house key. I then "christened" the scrape & left.
I later met them for coffee to see how they liked the property. They were all excited and when I asked, "Did you see any fresh sign, scrapes or anything?" they looked at each other like they shouldn't tell. Finally, after I assured them I wasn't hunting on their lease, they told me about this "huge scrape" they'd found, right by the trail...and they knew it was fresh because they got down on their hands & knees and smelled it.
I asked a few questions about it that showed I knew exactly where & what it was, then asked them what type of rack made those multiple & vigorous rubs. While they were deciding, I pulled out my key ring, held up my house key & said "maybe this one?". They'd been had but were good boys & enjoyed it.
They took a few bucks outta there, but never the monster that made that scrape.