Better explanation: https://www.cbsnews.com/news/titanic-telegraph-distress-calls-salvage-judge-ruling/
The better explanition provides no justification whatsoever. I was still using HF radio in the 1970's in the USAF. The ambiguities of HF radio propagation are a consternation to this day.
The company said it plans to exhibit the ship's telegraph with stories of the men who tapped out distress calls to nearby ships "until seawater was literally lapping at their feet."
Read a little of this to understand why the effort to recover the Marconi device is a ridiculous farce.
https://en.wikipedia.org/wiki/Ionosphere
As someone said above, follow the money. Grave robbers stripping the jewels from the deceased's fingers.