I see that the source listed on the profile does give his exact death date as well as the location. The information box for his death should be updated to this information if its correct. Might just be overlooked by the PM, but maybe you could ask them if there is perhaps a reason for the omission?
Otherwise I would say I think it would be fine to go ahead. As for contacting a project , here is a help page that might answer that question, http://www.wikitree.com/wiki/Help:Pre-1700_Profiles