That's because Autobots being good and Decepticons being bad isn't a universal constant.

[ and Starscream knows this. Cliff's presence and actions had proven it. further more, Megatron had believed it and put faith in the Autobot. so it's easy to see why Starscream relaxes completely. "everything backwards" means that they really are on the same side, wild as it may seem. ]

Patamon has it correct - from my point of view anyway.

[ the next part comes just as easily. he isn't in the habit of keeping secrets - or knowledge - from anyone. ]

I did say Cliffjumper. Though he is not the one from my universe, he has been a tremendous aid and a good friend in helping us keep Earth safe. A bit reckless and, ah... [ how does he put this... ] Takes pride in his work, but has proven his metal more than once.

[ there's also the fact the mech believes in Primus of all things, but Starscream doesn't hold it against him. ]