I am contacting you about this profile: https://www.geni.com/people/Heinrich-II-Margrave-of-the-Nordgau-Sch...
He cannot be the son of Arnulf, dying 937, as there is also another Heinrich, born 917:
https://www.geni.com/family-tree/index/6000000000628842070
Sincerely,
Egon Biechl
Heinrich II Margrave of the Nordgau & Schweinfurt