Do people still not see through his appointment? it's crystal clear to me

My take is that Trump (in the second term) appointed people he thought had expertise to the relevant departments but not to regulating them. He wanted the Secretaries to juice the economy from the Secretary position.

That doesn't, in itself, require corruption. But Trump clearly signaled that corruption would be overlooked so long as it was convenient for his admin (very similar to the Putin-oligarch model).