Yes, it is a fairly recent theory (about 5 years) and more time and debate is required. The author of the thesis is certainly a respected historian. 

But many still question whether the evidence is sufficient to suggest the primary objective was code related or whether it was secondary. 

In the end, they did manage to secure manuals from a U-boat as they had for the earlier 3 rotor iterations without elaborate efforts involving the slaughter of men. Hence the necessity for such a slaughter remains even if it was the primary objective. Perhaps there were two vain glorious egos at work - Mountbatten and (?) Fleming.

Generally, there is a reluctance for people to accept that men needlessly died as a result of horrible leadership and a search for a glorious purpose.