if you were wondering is Resurrection of Evil was included in Doom 3 then answer is YES.

I am not talking about BGF version. This is about the vanilla (the initial release) of Doom 3.

I activated Amazon Prime Gaming's Doom 3 BFG, I got Doom 3 as well, but I no page mentions presence of Resurrection of Evil which an expansion pack for Doom 3. RoE is not listed as DLC for Doom 3, nothing on store page, nothing on game page. If you do however compare sizes of the installer for D3, then it's bigger than base game.

I installed the game and I can happily say Resurrection of Evil is present in Doom 3 ( again, this is not about BFG).
Once the game is installed you can see RoE being available in context menu and in MODs section when you launch Doom 3.

It would really be good that game page in GOG Galaxy client contained information that RoE is included in the base game.