That seems to be sourced from a plain HTML page from 2001, reporting stats limited to the UK through the year 2000[1]. I guess it's not implausible, but it doesn't seem to line up with these more up to date US-based stats[2] where airline deaths are so close to 0 that it's hard to form a meaningful ratio between them and road deaths. If it were truly more dangerous on a per-trip basis, you'd expect the number to at least be a significant fraction.
But it's anecdotal, I mean, realistically, the plane is still better for long distance.
You can sort by journeys, vs, km.