I used you mods setup but without beltswitcher, the mod didnt work(at least with 11.22)--> No error; the game loads normally.
I didnt used the deactivated mods. To be sure they are not interfering you could copy them to another folder so they wont load at all.

You could update to 11.22 to see if this ...

in 10.8 there is an "error while loading enitiy prototype "beltswitcher" (transport-belt): No such node (belt_horizontal)"

I was able to resolve this by copying a couple of tags from the definition of the normal express belt :
entities.lua:
~ snip ~
Hey AartBluestroke, think you could fix the same ...

in 10.8 there is an "error while loading enitiy prototype "beltswitcher" (transport-belt): No such node (belt_horizontal)"

I was able to resolve this by copying a couple of tags from the definition of the normal express belt :
entities.lua:

data:extend(
{
{
type = "transport-belt",
name ...