3 things:
1) The letter is legit (It is in the announcements - for elders only) for this month (May).
2) I think this comes because of what happened with The Royal Commission (Geoffrey Jackson). What's he not asked something along the lines of who directs this organization? Maybe the want to get rid of the Holy Spirit for legal reasons.
3) I can't image how weird, from an "religion" stand point, would be to be in the meeting where they would go like: "All right boys, we need to get rid of the Holy Spirit on this question".