I see no difference in meaning, if in fact "is started" is correct. I would definitely say "has started", keeping in mind that "that's started" could be a contraction with either 'is' or 'has'.
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Zajoman it really is in a state we can call "started"I see nothing wrong with it. The past participle can serve as an adjective, or as part of a verb tense. You can even use transitive passive, instead of intransitive: "The war has been started." But we wouldn't say, "This is a started war." You also hear "is begun" and "is become," though they're no