QuentinGeorge
Legend
... The Dhampir -is- the Elven, Halfling, Dwarf, Gnome, Halfling, Dragonborn, Half-Orc, Tabaxi vampire.
Lineages in 5e are applied as a Template over a race that wipes out some, but not all, of the base race's abilities. An Elven Dhampir is different from a Halfling Dhampir.
Well I haven't read it so I can't comment as to the contents, but I guess as long as it preserves the intent of the 2e originals (ie, the hideous daywalking elf vampires, the humourless, arthritis-inducing gnomish vampires etc) they should be fine, though i do find it totally weird that they have decided to call them dhampirs.