Anyone claiming to be from the Pleiades star system is a poser/liar. The pleiades stars are very young, only around 100 million yrs old and are small blue stars which can’t yet support life. Look it up and use logical thinking.
Now that being said there could be beings from another space time that exists near the pleiades system in our space time dimension. But someone who claims to be from our pleiades is lying.