haha sheldon is a character...
while I hate to agree with that Dish Network dog, many, many jobs are done with copper clad wire for all the inside wiring. Example brand new homes built today are all wired with all copper clad wiring, an outlet in each room all being fed down to the electric meter. alot of basements are finished. people dont want holes drilled and black wires run all over the outside of their brand new house. And people dont want to spend custom money rewiring their entire house after the drywall is up. Most techs I know will rewire the easy stuff with solid copper. The line from the dish to the splitter solid copper. But rewiring entire prewired houses all over again? I dont know any techs that do that. It is what it is.
Any wiring done by a DirecTV tech will be with solid copper core. Heck, they have their name on their coax these days that the techs get for their trucks, so there is not even a debate about it. 3rd party companies should be the same, it's the private installer you might run into trouble with.
As for the wiring, of course that is correct. Here is the kicker to all this though, unless the runs are long, it really shouldn't matter. Only in long runs should it cause any real harm, for several reasons. When DirecTV designed swim, one of the benefits is that it doesn't use the same bandwidth as non swim, and was meant to be able to run over existing house wiring, and often times even work with rg59. They'd rather not ever do that, but it can be done, and does work for shorter distances. I know, I have tried it. They just don't want their techs doing that because often times there are other issues that cause bigger problems with existing wiring.