Interesting. I've never read a similar claim before. I've 100%ed the game like 30 times and I can only see a resemblance in one pic.
First pic. It looks closest to one of the cabins in MacFarlane Ranch next to the MacFarlane house but not identical to any actual in game cabin.
Second pic. While it greatly resembles the Warthington Ranch barn, that hill behind it makes the scenery look like the barn at Beecher's Hope.
Third pic is a far stretch. I can't imagine that road being anything other than the southern road in New Austin leading to the large waterfall.
There are a few places directly modeled after actual real life ones though. Since those pics don't show it, are you saying the resemblance is just with the layout of establishments and not how the establishments themselves look?