(1) Even if you want to say that they did absorb, nevertheless they are permitted for they will release it when they release the tzir.
(2) The reason is because salt does not cause absorption, it only releases. However, we have established that one of the reasons for the initial washing of the meat is because the salt can absorb what’s on its surface. Then we must say let that the reason that it won’t absorb over here is since the meat is in the process of releasing tzir the second salting can not cause it to absorb. This is indeed not the same case in sec. 69 where meat that was salted without a primary washing and the meat will absorb from the salt since it is not in the process of releasing. In a case later on, where we do forbid meat that had blood fall on it while it was in the process of releasing we should also be able to say that it didn’t absorb! The answer is that in this case the reason that it is forbidden is not because it was absorbed by the salt, but rather because the meat is considered roseiach and because of that reason it absorbs the blood.
(3) The reason is that as long as the scales are on and did not absorb, they remain entirely forbidden. Also, the fish are not forbidden because they were salted with meat, as there is no danger in salting.