It's not that he or Na`Vi in general has the "mental frequency" for LAN events only. It's that they are very good at handling the pressure of LAN event while some other teams with young rising stars might not yet be able to. That's why Online events aren't held with high regard. Players don't perform the same. It's much easier to play better in the comfort of your home (or gaming house) while only elite players can perform as well on LAN events with the pressure of having a crowd with several thousand people.
Being that said, Na`Vi has other problems. No strategy or teamplay (due to bad IGLing or bad coaching) and players who are not carrying their weight (mainly flamie). Electronic is fine, he's just in a slump, he will get back to his old form but Na`Vi HAS to sort out their other issues so that they don't rely entirely on s1mple and/or electronic having the matches of their lives.