No it doesn't. They don't have some new and incredible technique here that no-one else has considered. xG is hardly a big secret known only to Liverpudlians. Football is a multi-billion dollar industry. Every decent club will use every means at their disposal to identify targets and mitigate the risk of a transfer turning out bad, and that won't be identifying transfer targets just using data models. This is real-life not FM2018.
They've experienced some sound judgement and a bit of good fortune here is all.
I'm not saying that they have some top secret shit, but xG and serious football data is something that has been around not that long, and as far as I know, Pool is the first big club to appoint analyst after these changes and, as you've pointed out, he's got sound judgement and good fortune.
Not sure every club out there relies on data driven decisions, change takes time and that'd mean a lot of scouts getting replaced by nerds