In other words these new genes from different organisms are expressed. Furthermore there are all kinds of examples of modified genes which make modified proteins. The idea that such mutations are forbidden or inhibited at the level of translation is quite silly. Incidently the wording of this paragraph indicates that Kouznetsov is on unfamiliar ground. In other words he does not know what he is talking about.
Every population contains considerable variation at the level of the gene.
For many genes there are multiple alleles and each one makes a slightly different protein. If Kouznetsov knew anything about biochemistry, genetics or evolution he would recognize that his statement is ridiculous because his postulated mechanism would also suppress such variation. I have no idea what kind of powerful cytoplasmic suppressors Dr. Kouznetsov could be referring to. It is probably safe to assume that these are figments of an overactive creationist mind. If such substances existed I would know about them.