A Skeptic's Guide to Aliens

A HPANWO TV reportage of a live event by the London Fortean Society with Prof. Chris French, A Skeptic's Guide to Aliens, see: http://forteanlondon.blogspot.com/2019/11/a-skeptics-guide-to-aliens.html. Prof. French believes that all claims of alien contact can be explained by psychological phenomena such as sleep paralysis and false memories. Is he correct?
See here for more information: https://hpanwo-tv.blogspot.com/2016/11/ben-emlyn-jones-live-as-assap-seriously.html.
And: https://hpanwo-tv.blogspot.com/2018/01/skeptics-2018.html.
And: https://hpanwo-tv.blogspot.com/2019/04/ben-emlyn-jones-live-at-truth-seekers.html.