You are totally right on it.
Purely from performance characteristics its clear that the cuda codes for Beam and likely also for all the other algorithms are own work and original.
The fraud is only on the recently introduced AMD Beam code that seems to be just the lolMiner code with small modification (two kernels renamed and one kernel doing a small extra output that their miner seems to need) but with double fee. Only purpose: pushing me out of the Beam market and getting more of the cake. And this is not fair. As said, I believe the other codes are their own work and on professional basis I must admit I am always impressed by the speed this cuda codes have. But with this AMD code you gone too far.