Their NWT is pretty clear that this only applies to spirit anointed Christians and not to ‘all’ Christians.
I agree but that is stating the obvious. The NT was written to various congregations of believers, all of which were annointed until Russell invented the two-class salvation doctrine - one salvation with the new covenant and another one without it.
So, there is no problem with whom it applies. The question is what does the WT think is absent from the body if not a person?
[V.8] We are confident, I say, and willing rather to be absent from the body, and to be present with the Lord. - KJV