What they are arguing is that three smaller engines will weigh less than two larger ones, that the noise from the third engine will be mitigated by the "trough" created by the tail configuration, and that the smaller engines will allow a shorter and lighter landing gear.
I don't think that it's going anywhere, because the two jet/three jet question has been answered now for some time, the additional maintenance, etc. just ain't worth it.
As to the supposedly innovative idea of using the tail to mask the signature of rear mounted engines:
It's been around for a while.
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