I I hadn't seen that. Explains things I guess but it makes it no less dumb to not mention what happens IMO. It's one of the things I would knock the movie for.
They talk about it a little here: https://au.ign.com/articles/2014/04/15/dawn-of-the-planet-of-the-apes-producer-dylan-clark-on-building-a-simian-empire
Ultimately,
Seeing the house pretty much in tact - photos, camcorder and all - implies to me that Franco's character died. Of course he could have got out of there quickly, but just based on how much possible exposure he could have had to the virus, as well as the emotional scene in this film with Caesar in the house...I think directly addressing the fate of his character wasn't really necessary.