Spot on Perry. It's a completely unscriptural teaching. Being a Christian and being in the new covenant are concomitant, inseparable. No such thing in scripture as a Christian who wasn't in the new covenant. It's like saying there was a Jew who wasn't in the Mosaic covenant.
Nobody can escape Adamic death without being in the new covenant, period. JW's are convinced they are going to pass right on through Armageddon wearing white robes standing in the 'naos' inner sanctuary itself without being in the new covenant. Ridiculous.
It's obviously a 'good news' way beyond what Jesus or the apostles taught. It's Rutherford's 'good news'. JW's need to decide who they believe, the apostles gospel as recorded in scripture or Joseph Rutherford's gospel.