Here's the best source I could find. There are plenty of copies of the transmissions, of course, but NASA says, that, uh, well, uh, ya know, we kinda, or somebody kinda, re-taped over the originals, uh, maybe, it can happen, ya know.

It's a shite story. The originals seem to be gone, which would certainly be the best source of disproving them.

We're supposed to believe that the people in charge of mankind's greatest achievement forgot to keep the original videos. Sure they did.

https://www.space.com/nasa-apollo-11-moonwalk-lost-tapes-auction-statement.html