It looks like these platforms haven't been added to the theme yet. You can do it yourself if you like, but keep in mind that when the theme is updated any changes you've made will be gone.
Anyway if you want to add them, navigate to:
LaunchBox\Themes\COLORFUL - Light\Plugins\Ao.Bigbox.Themer.v3_9_7a\AssemblyConfig
There you'll find 2 files that can be edited in any text editor.
Open Ao.Bigbox.Themer.v3_9_7a.dll.config and add the platform names.
<add key="Platform.MICROSOFT_MSX2" value="Microsoft_MSX2" />
<add key="Platform.NINTENDO_POKEMON_MINI" value="Nintendo_Pokemon_Mini" />
And in Ao.Bigbox.Themer.v3_9_7a-Colors.dll.config add the colour values
<add key="Platform.MICROSOFT_MSX2" value="#3547a1" />
<add key="Platform.NINTENDO_POKEMON_MINI" value="#36416e" />
I think MSX is already added, but with no value, so you only need to add the value for that one.
I've got my main games collection on another computer, so I haven't checked if the colour values for the platforms are correct. May be a bit off.
Hope this helped