My guess is they have. even If they survived the Proud Clod explosion, I doubt they survived the meteorfall. Hojo did, but his body vanished and his mind was transferred to Weiss.
Yes, Scarlet and Heidegger died during the Raid on Midgar when they challenged Cloud and the party in their "ultimate weapon" Proudclod. Upon defeat, the Proudclod malfunctioned and exploded, killing both Shin-Ra executives in the process. The only mentions and appearances of the two in other Final Fantasy VII releases have been in prequel games, namely mentions in Crisis Core and cameo appearances in Before Crisis. -- ∙ ∙ 00:36, April 7, 2013 (UTC)