No, there is direct suppression going on. I'll use an extreme example - to provoke discussion. What have you heard about the Pyramid of the Sun recently? (It should be pointed out that this has the potential to turn European archaeology upside down). On a personal note, wouldn't we imagine that the Early Metal Mining Group - probably not their correct name - would trample the door down after a new prehistoric copper mine had been found?
If those who promote the "Pyramid of the Sun " had anything to say and I was interested I could quite easily find find out about it . There is no supression of their of views . Similarly there is nothing to stop anyone suggesting they may have found a "new" prehistoric copper mine and no supression of that suggestion .