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Your outbound message from Content Builder can't contain this code - for your unsub process to work, you actually need to have 2 messages:

1. A message from the Text Response template that's configured in Mobile Connect which needs to be set up on a new keyword (like UNSUB). Here you need to implement the code you had before or the code I posted below.
2. Your initial text message from Content Builder will now have to use the Next Keyword option - you need to set it to your new keyword (like UNUSB)

This will work this way:

Your outbound message gets sent to the customer and the system will know thanks to the Next Keyword that it should treat all incoming text as if it was coming to your Text Response message configured on the Unsub keyword.

Old answer before the comments posted below

I think I had the same issue, as I never could get [MSG(0).NOUN(0)] to work while using a Text Response template, so I went with a workaround:

set @inbound = [MSG(0)]
set @verb = [MSG(0).VERB]
set @message = Trim(Replace(@inbound, @verb, ''))