What marketing are you speaking of from Apple that does not have the disclaimer?
You keep talking about the disclaimer. Let's say that Apple created an iPad that uses the European LTE frequency so it works on their LTE networks. Then, without making any changes to the device, they marketed it here in the US as a 4G LTE device, but included a tiny disclaimer at the bottom of the website saying that it only does LTE in Europe. Everyone here in the US would buy it, and everyone here in the US, including you, would be pissed off.
Yes, the disclaimer might be there on the website. And yes, people should read disclaimers. But not everyone orders from the website. Even if they do, the fact is that the websites are directed towards different countries. Apple can change the prices on the UK website so that they're in pounds instead of dollars. But they leave the same LTE claims on there, knowing that it won't work in the country they're selling it in. That's wrong. Legally it MIGHT be just enough to keep them from getting in real trouble, but it seems very, very shady to the people purchasing the device. Apple should take the high road here and change their advertising in the countries that can't make use of the 4G LTE that it offers.