It's possible that there was some spying. It wouldn't be unheard of in football, used to happen a lot, used to be on the clubs/national teams to take measures to protect against it. However, there's no 'definite' or anything close to it about the espionage from England claim. Players not known for taking pens could have been decided via other data, such as: stronger foot, ball striking technique and so on(things they do know).
I'm not even sure how much of a 'cheat' it would be. It's penalties, even the list they had from spying could have ended up being wrong when it came down to it, just based on the players' ability to change their minds, based on how they are feeling and/or the keeper in front of them.
Liverpool hacking scouting networks should have been followed up, it wasn't and we can take a good guess why: Certain clubs(two in particular) appear to be off limits for disciplinary action from the PL. Worse still, they are pandered to, rules are introduced to suit them and everyone is supposed to go along with it and pretend they don't see it for what it is(which most of the press do).