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I'm pretty sure that the spirit of the feat is not to provide a loophole for Paragon Surge that they had previously closed and grant someone every spell on their list as a potential 'known' spell. The spirit of the feat is that you can do things like change resist energy(cold) to resist energy (fire).
Note that in my version (the first one anyway) this feat is still very useful with Paragon Surge, just not brokenly useful.
You seem set on reading it the way you want though, so good luck to you.
The book Emergency Attunement came out in was released in July 2013The Errata for Paragon Surge came out in July 2014. So I don't think they intended for the feat to bypass an errata because it came out before that errata existed.