To my knowledge, nobody has ever taken a straw poll of catastrophists regarding evolution. Subjectively I'd say that between 85 and 90% of catastrophists view evolution as a joke, but the ten percent includes Ev Cochrane and a couple of others. I once saw Ev start to talk about evolution in a restaurant and a lady friend of Gunnar Heinsohns and Heribert Illigs looked at him like he was insane and said "there's no evolution, Ev", much the same way you'd tell a child that the Easter rabbit wasn't really real.
I personally do not see any version of abiogenesis without intelligent input of some sort being workable. The closest thing any catastrophists have ever produced to something like a final vision of Velikovskian abiogenesis is in "Solaria Binaria" which you can get (on the quantavolution CD) from Al DeGrazia's web site at www.grazian-archive.com.
Evolutionists work at keeping evolution and abiogenesis separate and I would also have to keep my own theories about genetic engineering separate from the question of how life got here in the first place.
The genetic engineering which used to go on on this planet, as I see it, was being done by the creatures themselves, i.e. no genetic engineering overlord was involved. The precise mechanisms being used I don't have much of an answer for other than the articles you read about gene transport, such as the one I noted above.
The other kind of question is where did the intelligence and/or compute power for that sort of thing come from in the antique world. That I believe I do have an answer for.
As to the question of where did the genetic engineers go, the answer is that the capability of using the human mind (or the minds of other higher animals) in the manner which was involved in those kinds of phenomena has been ground out of the races as described in the linked article, and no longer exists.
The other starting point for that kind of thing is Julian Jaynes "Origins of Consciousness" which I believe everybody on the planet should have a copy of.
The authority AND the intonation! That settles it for me!
Moreover, amongst the few borrowed words, there are a sizable number of what are called "reversals". In other words, when IndoEuropean, Semitic, and other peoples met in the Mediterranean basin, since some of them wrote from right to left and others wrote from left to right and since vowel sounds were not written at first, when one nation borrowed a word from another, the order of consonents frequently got reversed.In a word, "no." If that's not enough words, "No, no, no, no, no, no, no, no, no!"
In times before literacy was common, when people borrowed words as a result of foreign contact, they borrowed the sounds, not the written forms. It's absurd that anyone would get the sound wrong because the writing is "backwards." In the times you describe, the typical person couldn't read or write his own spoken language, much less any other. Script differences would not cause the confusion you attribute to them.