‘Moneyball’ is now used as a catch-all term for finding value where others don’t. In football that could be scouring leagues/regions others aren’t as invested in (e.g Brighton) and taking multiple high risk, low cost transactions, could be finding value in players underperforming at other clubs, could be stat based approaches to identify players who add value to your team/system, etc..
Moneyball was originally wedded in using statistical base approaches to find players who can add more value that it would seem via normal measures. Every club use statistical based approaches now (across most team sports). I don’t think there’s the potential gains there were in the past. As such, people use Moneyball as that catch all term to describe what they perceive as smart recruitment - whether that’s a signing for 700 k or 70M