The sum total of Intel's official communications about Lunar Lake can be summed up in this slide. It's from the same presentation that that article is referencing.
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As you can see, they lump together Lunar Lake "& Beyond" into one group, and also include "External" for the manufacturing process. As you point out, using 18A would imply a 2025 release, so clearly not everything there can apply to Lunar Lake alone.
Most Lunar Lake rumors have claimed N3, which would fit with the "External" label, but Intel's not officially confirmed one way or another.