"That overall rate is far above what scholars say it should be. Research from around the world pegs the actual rate of false allegations made to police at somewhere between 2 per cent and 8 per cent."

There is no research that "pegs" the actual rate with this degree of accuracy. There are many studies of that get numbers that are much higher. The 2% to 8% is a factoid agreed upon by the victims' advocates.

Here is a good introduction, with references:
http://www.cotwa.info/p/false-rape-allegations-assault-on.html

It is worth remembering that a small fraction of rapes are reported, but every false report is reported. False reports may be rare in contrast to the overall number of sexual assaults, but they show up as a much larger proportion of reported sexual assaults. The police do need to be on guard for them.