Yaarel
🇮🇱 🇺🇦 He-Mage
The UA Gothic Lineages (that mentions Hexblood, etcetera) explains how the designers use the terms lineage, race, npc, and monster.That might be how you use the terminology, but it certainly isn't how WotC does. Lineages are things you can be born as or become, races are just things you're born as.
Lineage = Mutation, Race = Species
Van Richtens and the Wild Beyond the Witchlight both prove that.
Lineage ≠ mutation
Lineage = species
Lineage = PC race + NPC monster
Both player race and nonplayer monster can belong to the same lineage.
Richtens, Witchlight, and Fizbans confirm that.