Where are the studies that show this, great you have listed a couple of authorities, just because they are low carbers doesn't make them right, all the points you mention are opinion or hypothesis unles you can present the data that proves it.
I have not advocated a Ketogenic diet,
But from the evidence that I have seen presented I do not think it would likely be a problem, but I would like to know more if there is more to know.
On balance if you are planning pregnancy then go the safest bet with a well rounded Primal diet, I agree there is no substantial evidence to say a Ketogenic diet is safe in Pregnancy in all circumstances, but likewise for the counter argument.
So let's just have the discussion without fingering individuals as "Baby Killers" to support your own opinion.