David Icke was going on about all that illuminati stuff years ago and has published many books on the same subjects. He actually thinks that the royal family are bloodline reptilians
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His website seems to have been attacked and he's been hounded from Twitter now due to his Covid19 theories. I tried to read one of his books a few years ago and it made my head spin.
To be honest it's best not to fail into the conspiracy theory stuff because you'll just end up feeling crazy and there's nothing you can actually do about it (even if there is a grain of truth in what he says).
Best to forget about it and try and enjoy your life as much as you can. So stay well and have a comforting banana