try

home-manager/programs/default.nix

@@ -13,7 +13,7 @@
         ./firefox
     ];
 
-    config = {
+    config = lib.mkIf (config.homeconfig.host != "android") {
 
         home.packages = lib.mkIf (!config.homeconfig.wal.enable) [
             inputs.nixvim.packages.${pkgs.system}.default

home-manager/users/nathan/packages/default.nix

@@ -23,6 +23,7 @@
         };
 
         home.packages = with pkgs; ([
+            sops
             killall
             btop
             zip    

system-config/configuration/android/default.nix

@@ -25,6 +25,7 @@
                     homeconfig = {
                         graphical = false;
                         minimal = true;
+                        host = "android";
                         #homeScripts.enable = false;
                     };