Consider that literally everyone used to believe it was either benign or beneficial, (including western experts before they got expelled) used it for various purposes and noticed no ill effects. It was found in the neanderthals. Now you come and claim that everybody is wrong.
You know that you can look up "lead poisoning" and it effects, right? It's an entire thing with many studies into it and a well-understood mechanism of how it happens and so on? It tastes sweet and is a very useful material and the toxicity is delayed because it builds up in the body over time, especially through touch rather than consumption. The symptoms might also not be immediately noticeable, especially if malnutrition, parasites and other contaminants are also widespread.
If you want to get into a conspiracy of Western corporations trying to suppress a useful thing by spreading lies about it contrary to traditional wisdom, maybe try hemp/cannabis (no, not just for getting high: there are plenty of industrial uses hampered by the illegality of "marijuana"). Lead seems like a really bad hill to die on given that it's been known to have adverse health effects for over 2000 years (while continuously being used because it was so darn useful and contamination was often limited by how it was used for most of history).
It's in part outright lies, in majority calling the healthy state defects and the defects the healthy state. Yes, the body accumulates it, because it needs it.
The conspiracy isn't that corporations supress it, the conspiracy is that corporations paid the experts to argue against its toxicity.
It hasn't been known as poison, there are only a couple of dubious quotes over the 2000 years, when it was used in cosmetics, medicine, even food preparation. The belief of its neurotoxicity is only about half a century old, with no determinable origin of its discovery.
There is a couple of dubious quotes, the well documented fact that they cooked in it rather strongly implies that this belief wasn't widespread either.
It really seems like the climate change debate, only that the deniers won, and those who claim otherwise are getting silenced even as the effects are becoming obvious, and people desperately look for some explanation why people are getting increasingly ill, frail, weak, and dumb.
