Was Fallout 3 meant to take place much earlier?

A popular theory online is that Fallout 3 was initially meant to take place much closer to the Great War. Looking at the evidence has convinced me that this is true, but can it convince you? Timestamps: Design Docs 3:27 Prewar Emphasis 4:18 Presence of BoS and Enclave 7:51 No Governments 11:02 Circumstantial Evidence 26:12 -No Agriculture 26:45 -Project Purity 29:15 -Wasteland Survival Guide 31:50 -Mama Dolces 34:50 -Vault 101 36:12 -Megaton 38:25 -Naval Research Institute 40:10 -Vault 112 42:39 -Little Lamplight 44:48 Summary 49:24 Comment Highlights: 52:55