@MattB101Think it's the V2 that has two.
The newest original from Svomesto is the KFL Plus second batch. They, and all of the originals, have one airhole. The EHPro Plus v2 and some other clones have 2 air holes.
The two air holes really don't make any difference. The air intake is still limited to the center tube. The draw is the same on both the original and the clones. (Yes, I have an original, an EHPro, and another clown.)