I have seen code that does: Assert.That(() => instance.Method(parameters), Is.True);

There is no need for the lambda.

The lambda is only needed if:

• Expecting an exception, like in: Assert.That(() => instance.Method(parameters), Throws.InvalidOperationException);
• Using DelayConstraint, like in: `Assert.That(() => instance.Method(parameters), Is.True.After(1).Seconds;

I would like a new Analyzer with code fix that is raises issues and allows removing the lambda.

This rule is the opposite of NUnit2044 (Delegate Required)