I don’t think there’s any documental direct evidence, but a close analysis of his published works, witness accounts, and the work of Ken Shoulders, allows to see the parallels and similarities.
So no documentary evidence, but you think someone once said it
There was a fairly sane account of Tesla's life and works, written by John O'Neill in 1944, called Prodigal Genius. For many years it was one of the few biographies - and is probably the only one by someone who personally knew Tesla. According to O'Neill, there was nothing "unconventional" about the wardencliffe transmitter - even though it was a bit mad.
People who invoke Tesla as some kind of evidence for the existence of any "unconventional" phenomena are not doing themselves any favours, I'm afraid.