It doesn't appear to be a rumor. Unfortunately, it sounds like preservation of the scrolls* would be the least of the worries if the volcano erupted! The last time it happened, it created a new shape to the bay! Yikes.
Naples sits on volcanic monsters - and one of them threatens to consume the city
Beneath one of Italy's most densely populated cities, there is danger brewing.
www.bbc.com
Seismic storm hits Italy’s Campi Flegrei super volcano with strongest earthquake in 40 years
For those who want too much information on the Campi Flegrei caldera...
Potential for rupture before eruption at Campi Flegrei caldera, Southern Italy - Communications Earth & Environment
Unrest at the Campi Flegrei caldera, Italy, is consistent with the start of rupturing below the surface and a possible return to volcanic activity, according…
www.nature.com
*Don't get me wrong. Losing the scrolls, now on the verge of being readable, would be a tragedy!! But the scale of the potential eruption could be devastating for the entire region and possibly the world it sounds like. Yikes!!