It's not on steelydan.com and it's not on any ticket site that we've looked at. No, the only place listing a July 8 date for Steely Dan playing Villa Contarini in Padova, Italy is the site run by concert promotors D'Alessandro & Galli:
It might prove to be a true listing, but it could also disappear like the early listed July 7 Arena Flegrea, Napels, Italy date on steelydan.com.
Two useful links:
steelydan.com - The only place for confirmed dates
dandom.com/Bluebook - The fan page for breaking news, views and the occasional rumour.