Flóki of the Ravens - Vilgerd Horda-Kåredotter (mother of Floki of the Ravens) is 70 years younger than her son, Floki of the Ravens

David, I wonder if perhaps there are two Floki's confused?

Floki-Hrafna went to Iceland in 868 with his wife and children (at least one being marriageable age) and this date is where the estimated DOB of 830 comes from.

Vilgerd's father Horda-Kåre Aslaksson, Herse i Hordaland current has a DOB of c870 and this gel's logically with the estimated c900 DOB of his alleged daughter Vilgerd Horda-Kåresdotter

As you say Vilgerd born 900AD cannot be the mother of Floki born 830AD.

Two points:

A) Horda-Kåre cannot be born 870, he is a powerful noble during early years of Harald Fairhair's regien (872-930) and 2 year olds are never described as powerful nobles! https://no.wikipedia.org/wiki/Horda-K%C3%A5re says he was born in the 700s but that math doesn't work either!
So clearly both Horda's DOB and his children's are later than the should be.

B) There seems to be two very separate mentions of a person named Flóki Vilgerðarson in Landnamabok. Chapter 2 describes our famous adventurer, which is logical given he is almost the start of the history of Iceland, but the second mention is Chapter 65! This man is being described with a group of other random settlers and in my translation at least is named as "Flóki son of Vilgerðar Hörða-Káradóttir ..." https://www.snerpa.is/net/snorri/landnama.htm

I can't read the original text and haven't looked at Landnamabok in years but given two separate chapters and the obvious math issues I have disconnected Hrafna-Floki from Horda-Kare's descendants.

This means several of the children currently connected to Hrafna-Floki actually belong to the later settler, perhaps the wife also?

Chapter 2 only mentions one daughter Chapter 2

Flóki Vilgerðarson was a man's name; he was a great Viking; he went in search of Garðarshólm and sailed from there called Flókavarði; there Hörðaland and Rogaland meet. He first went to Shetland and lay there in Flókavogur; there his daughter Geirhildur got lost in Geirhildarvatn.

Who doesn't seem to be on Geni at all.

The current wife has a DOB c.880 and location Iceland, which would be fine for the later settler but makes no sense for Hrafna-Floki.