I don’t think the Sea People are particularly “unattested” and the only mention of Sardinans is that the dig was in cooperatiion with researchers from the University of Cagliari, in Sardinia. I swear that is what I read. Go back and take a peek, if you would, and see if I’m imagining that!
“...cooperative delegation excavating there during 1993-2000 from the Universities of Haifa and Cagliari (Sardinia), headed by Prof. Zertal.”
(’: Yes, in this article excerpt, that’s the only mention of Sardinia — but the otherwise unheard-of Shardana have been claimed to have come from Sardinia, along with some other places. :’)