Absolutely, it is quite likely bogus. I would love to know if the website really meant to connect this to climate change, and if so what the mechanism is.
What is needed is a graph of global lightning strikes increasing inline with global temperature rise and that does not exist, afaik - globally lightning strikes have been consistent year on year. But nowt jumping out google wise and would of thought if lighting increased, we would know. Equally if the strength of lightning increased, that would also be measured and known.
However there is data of lightning in some area's increasing, others less so and does seem to balance out, but not clear cut data set to know for sure upon that one.