in Lincoln's D1.8 manual, annex B, page 44, it appears that the excalibur 7018 is the only lo-hi 70 series welding electrode that satisfies all the CVN requirements for the filler metal intermix.

Is this accurate?

I'd say yes as long as it's the correct trade name, AWS classification, and it's used in combination with it's designated root or fill electrode that bears the correct trade name and AWS classification shown in the test results.