Have scientists ever observed a mutation that introduced new genes?
Is there ANYONE out there who can answer this question?
Yes, they have.
And if you have two copies of the same book but change one a bit then you have more information yes. Or in the case of genes too copies of the exact same gene can produce more of some protein output which may have a biological effect.
So when did the house become something other than a house?
This particular behaviour is called a "gish gallop" (you can google it).
It is an example of disingenuous debating and an inability to stick to the topic.
When did a reptile stop being an amphibian? When did we stop being an ape?
Or to answer a stupid question with a stupid answer: When there are so many skylights we call it a greenhouse. No one additional skylight makes it not a house but at some point we would classfy it as a greenhouse.