Really nice guide, she can still do well however when she falls behind, her natural scaling is very strong.

and Tank Nidalee still needs TriForce for the 85% bonus sheen damage

My way I build Tank Nidalee is that I'd still like to pressure early game. With the Iceborn Gauntlet, I feel like for an item you would rush, it doesn't offer as much damage as a Triforce would. You would technically be a complete tank with no real scaling damage. For example, multiple top lane bruiser champs take one damage item to rush and then scale into late game as a tank. Trundle, Shyvana, Renekton (although you can build full damage), Alistar, etc.

But I added a situational section for the gauntlet. Thank you for that error I made as well, editing now.

Overall it's well put together, but I can't possibly fathom why a TANK Nid would buy Triforce over Gauntlets. Even just for split pushing, Gauntlets are better for the wave clear aoe, tankiness when their team comes, A SLOW, and a larger mana pool to spam abilities. Unless their team is mostly AP, Gauntlets are almost always the better choice. You can always add damage with other items.
That's just my logic. I know triforce can work, but it's so much higher risk, with less reward if you ask me. You can still hit 1000+ cougar Q's with a Gauntlets proc.
Also, you're missin a Quint m8. xD

Good luck in the fray scrublets :D