Thanks for pointing that out! It should apply equally to Decepticons.

So the rule will continue "If a Decepticon owns a Decepticon property like 'The Nemesis' or 'The Smelting Pools' then double rent may be charged when a Autobot lands on it. Decepticons pay standard rent. Only standard rent may be charged for 'neutral' properties like 'Earth', 'Cybertron', 'Vector Sigma' or 'Transwarp Drive'."

Your point just inspired another rule (or guideline) - 'As far as practicable, each game should consist of an equal number of Autobot and Decepticon players.'