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They did change how you can access certain parts of the spell data.
I use the following in my portals addon.
On PLAYER_ENTERING_WORLD event I make a call to C_Spell.RequestLoadSpellData(spellID) for each spell I will need info for.
On SPELL_DATA_LOAD_RESULT event it returns the spellID requested and whether it was loaded successfully. You can now access the data. I vaguely recall having issues retaining the info for later retrieval so it was at this point that I stored the information I needed.
Some of the spell functions I believe do not need this process. But I am not sure off the top of my head which ones they are.
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