Steam still allows shipping a depot for 32 bit Linux, but I don't think anyone uses a 32bit outside of VMs.
If you don't, I believe the game requirements specify it must be 64-bit.
I mentioned this elsewhere, but just to explain again. This plugin has stubs in the AGS engine, so if it's not found - the plugin, not the steam store dll -, the game should load but all of these plugin related methods will return either null or false and it will not work.