I have a number of models I have exported to FBX. This one is a 2.5MB blend file, but it produces a 110MB FBX. I don’t think there is an animation, or if there is I can’t find it to delete it. I’m not an expert, so maybe a tip on that subject is what I’m missing.
Your objects have very high subdivision levels with their subsurf modifiers so the poly count is equivalent to 6.5 M triangles !! Saving this as a blend file gives a size of 113 MB , even when compressed !
Exported as a .fbx file and then imported that .fbx back into blender. You see a lower poly number with the original blend file because the subsurf modifier for each object is not set to be active for the viewport, only for rendering, so also active during exporting
You will also see you have a much higher level of subdivision for the render than you have for the viewport so again the number of verts will be different