To avoid confusion, the prossie is from Toronto, Canada. The Sun article and the prossie book doesn't seem to be related to the UK, except for that sentence in the article mentioning UKP as the most popular site for reviewing UK escorts.
But many prossies tend to use the same arguments as she regardless of which country they're in (see Australian prossies and their attacks on their local prossie review sites). To them, escort review sites must be 100% positive comments and even then, prossies must get to pick and choose which positives to keep, they believe, for example, a prossie can demand a comment about her doing sex in a review be deleted, because it "violates her privacy and human rights", despite the fact she advertises sex and is a prostitute.
For those who've been around a while, some may remember prossies attacking Pro$$ieNet for the same reasons as they attack UKP today, despite the fact that Pro$$ieNet was blatantly biased towards prossies and pimps. Negative reviews and comments were censored by the thousands every month. The owner (Galahad) was exposed as making over £15,000 per month from pimp advertising. There were threads exposing how Galahad had deleted negative reviews about prossies that he had fucked, in one instance he was forced to undelete one review after being challenged by his own prossie moderators (i.e. BBWClaire). There was even a facility for prossies and agency pimps to "opt out" of reviews altogether, so unsurprisingly all the scammers and bait and switch fraudsters would opt out, so when a punter searched to find reviews for prossie or agency they would find zero warnings from other punters. Despite all this, some prossies were still not happy with Pro$$ieNet, and demanded even more censorship.
Regarding traffic, with the exception of a 100-200 extra guests online I don't see much boost in traffic. The Sun is dying, along with Murdoch's other papers. Daily Mail has replaced it. So maybe it would be better if they ran an article on their frontpage referencing UKP.