I agree, but if this leaning person decides to move away from you of his own accord, will your arm straighten? I don't think it will. I'll have to look up the particular muscles and get back to you, but in your example, I think muscles in addition to the triceps are being employed to prevent further bending of the right elbow. These same other muscles are the ones you use when you have bench pressed a barbell and you then make sure the return trip towards your chest of the barbell you have just pushed away doesn't happen too quickly. A better example of the extensor action Kelley is talking about would be trying to push the person away from you but he's so heavy you can't until lets you. In this case the triceps is active; it just can't do any work until it's allowed to. I don't know what this means relative to a golf swing but how do you make an active right triceps only stretch the left arm in swinging and actually drive or move it in hitting? I don't think there is a steady effort to straighten the bent right arm in Swinging. I think your example would actually be more correct than Kelley's in describing the role of the right arm in Swinging. In your example the right arm is not actively making a steady effort to straighten. It's only trying to resist bending.
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