But that's just my point. His argument isn't faulty, and you are attempting to attack a 50 second statement by attacking the specific wording.
1. in principle, procreation is always possible.
2. in principle, procreation is possible.
1 and 2 are equivalent statements. A man qua man and a woman qua woman can procreate every time. We are nitpicking, but you are still wrong in the nitpicking. His overall argument stands either way.
This will be the last time I state this. If you use
always in a statement, then you are saying under all circumstances A will
always happen. So, using your examples.
1. In principle, procreation is
always possible.
-meaning no matter the circumstance, which is contradictory to the meaning of "in principle", or in used in the following
a. In principle, procreation is
always possible between man A and woman B.
2. In principle, procreation is possible.
-this is the correct usage of in principle, but by inserting
always you are effectively contradicting the usage of "in principle"
In final summary, his argument is still both invalid and unsound. He has formed a contradictory argument, which would have been noticed right off the bat in a Reasoning and Critical Thinking 101 college class.