Seems like you’re right, it is a Fresnel lens!
Do you say that it is not a good choice due to the artifacts created or some other reason?
BTW, the T28 Artemis review is here: “REVIEW”: Brinyte T28 Artemis – Hunting Flashlight – 21700 - Zoomable (Fresnel) – G/W/R - Rotary Switch [Pic Heavy] .