Freeman Dyson is not a climate scientist at all and never has been. Roy Spencer isn't a "renowned scientist"; he's a paid oil-industry shill. Lindzen used to be a scientist; now he's retired and gets paid to be a Cato Institute shill. Judith Curry also used to be a scientist and quit her academic job; presumably being a shill pays WAY better.

So, basically, yes, they are all bought and paid for, or, they simply have no credentials or knowledge of the field in question.