Freedom of speech means that the government shouldn’t arbitrarily keep you from expressing yourself in the way you see fit.
Censorship happens when the government supresses certain forms of expression.
Neither of these situations apply to this case. Google - as a non-governmental entity - can freely decide where to advertise and where not to advertise. And nakedcapitalism can freely decide if they wish to continue publishing certain content without Google or stay with Google Ads under their terms and conditions. No one is forcing either side to do anything.
Would you have the government intervene and force Google to advertise on a site they disagree with? Now that would be arbitrary