I agree 100%. Most of these monster Hogzilla hogs are hogs people kept well beyond time to sell and were pets or virtually pets.
About the only way that you are going to get a hog with 4-5" hooves is to have it raised like that and even then, I don't know if the hooves ever get that big. 300 lb actual feral hogs don't have them. Generally, feral hogs 300 lbs or more are rare, exceptionally rare at 400 lbs. Few people will see actual 500 lb feral hogs that grew up and lived in the wild and even then, most are going to be bar hogs.
Of course, "feral" basically just means a domesticated animal that lives in the wild, but you have escaped 'feral' hogs and you have hogs born in the wild and and living in the wild. Aside from the ones mentioned above. Adam Stanger killed a 780 lb hog, when you look at the pictures, you can see the upcurved slope of the head. The was a farm-raised hog that got out some how...
https://www.al.com/live/2009/10/big_boar_wild_hog_weighing_780.html
790 lb Boarzilla from San Antonio, another neighbor's pet hog that got out.
https://theflashtoday.com/2015/01/30/boarzilla-the-subject-of-hoggate-hearing/
707 lb hog from Transylvania, NC, obviously another domestic.
https://abc13.com/society/hunter-kills-707-pound-feral-hog/492886/
At 500 lbs, this is one of the largest feral looking hogs I have seen that doesn't look like it came off a farm. Jett Webb's kill is pretty neat, but I swear that in every picture, forced perspective is used to make it look even larger.
https://www.cnn.com/2014/03/13/us/north-carolina-500-pound-boar/index.html
There is this 986 lb boar that was killed that looks feral, but apparently the people from Arkansas believe it to be faked because the imagery doesn't match the time of year. Picture shows trees with no leaves but folks from Arkansas at the time said the trees all had leaves.
https://www.arkansashunting.net/threads/state-record-hog.236246/