I've seen those references, but they don't mean much. At least in my opinion.
Neither one cites a primary source.
Fabpedigree.com is notorious for being the biggest collection of genealogical junk on the internet.
Daniel de Rauglaudre (roglo.eu) often has good information and valuable clues but has to be used with caution. If you look at his links to sources for Alured, they are just average amateur genealogy posted by the owner of Fleming Multimedia, a computer company in Alabama.
The links don't match the citation: D. Thuret, The Peerage. I'm not able to identify this source.
If the citation means The Complete Peerage (which I doubt), it is a competent source but not always accurate. Notice that (according to this extract) Alured, although known to have been a Norman living ln Brittany, was born in England: http://www.thepeerage.com/p64.htm#i632