From the SA Compendium:
If you cast a spell, such as healing word, with a bonus action, you can cast another spell with your action, but that other spell must be a cantrip. Keep in mind that this particular limit is specific to spells that use a bonus action. For instance, if you cast a second spell using Action Surge, you aren’t limited to casting a cantrip with it.
I believe that Crawford is saying that if you cast two spells, one using an Action, and the other using Action Surge, there is no requirement that the second spell be a cantrip, as opposed to the situation where one spell is cast with a Bonus Action and the other is cast with an Action. His language is not precise, but I don't read this as negating the bonus action limitations. Here is Crawford's response to the direct question regarding whether action surge lets you cast two spells in one turn:
https://www.sageadvice.eu/2015/04/17/action-surge-spell-3/ Yes, you can cast two spells with action surge but you still have to be mindful of the rules regarding bonus action spells. Since Action Surge doesn't give you a new turn, the rule on casting Bonus Action spells should still be in effect for an Action Surge.
I can see where intelligent folks can read the same thing and reach different conclusions. Probably won't ruin your fun either way. Like zombies that keep making Con saves, arguments about Bonus Action spells never die.