Your reasoning would mean that the process that created all the prehistoric fossils is still going on. Yet we see no evidence that vulcanic activity is fossilizing large amount of animals nowadays.
The calculation on page one (wich used less that 1% of 6000 years to calculate the full 100 %) suggests that vulcanoes have been erupting at the same pace over the last 6000 years. Or would you suggest that the total number of vulcanic eruptions you calculated happened all at once, killing the majority of the animals alive and burrying large amounts of bones, after which all vulcanoes stopped and have been getting active lately?
Either way, it doesn't sound very convincing to me, but maybe you can shed some light on it.