Really, complete bullshit, just like "vaccines cause autism" or "MSG causes chinese restaurant syndrome". Do we need more studies to again disprove what already has been disproven? Bad bullshit science exists and "we need more studies" is its lifeline that keeps the gullible populace feeding it.

Oh and also. To make a scientific claim, you have to make a hypothesis. Not just a claim "5G causes cancer", but "5G causes cancer by this and this method". Without method of action best you can do is a corelational study, which is jus one step higher a case study, which is basically an anecdote.