[hristov]

Your link does not support what you are saying. The linked article says that: (i) there aren't enough studies for the toxicity of depleted uranium (ii) we know that uranium is chemically somewhat similar to lead (iii) there are a lot of studies about the toxicity of lead, so (iv) because of (i)-(iii) for the time being it and for modelling purposes it may be useful to assume that depleted uranium has similar toxic effects to lead.

In other words, the article admits that the author does not really know about the toxicity effects of DE and uses lead only as a best guess.

Furthermore, the article clearly distinguishes between the toxic effects and radioactive effects. Depleted uranium is less radioactive than the usual uranium, but it is still plenty radioactive. And the effects of radioactivity are pretty bad when you are breathing the stuff in.