Whatever nodes were already “unlocked” with cores will remain “unlocked”. It’s just the “mastery points” that are removed from all the nodes, to let you put them back into different nodes. Also, even though you won’t have to unlock existing nodes again with Cores (or the big amount of units from Cruelty/Precision), it still will cost you those lesser amounts of Units or Gold that nodes might have whenever re-applying points into them.
And also, don’t worry about how many Resets you have to use. It doesn’t cost you a Reset Item anymore (it will use one if you still have one, but after that can still do it unlimited times anyways).
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Also, even though you won’t have to unlock existing nodes again with Cores (or the big amount of units from Cruelty/Precision), it still will cost you those lesser amounts of Units or Gold that nodes might have whenever re-applying points into them.
And also, don’t worry about how many Resets you have to use. It doesn’t cost you a Reset Item anymore (it will use one if you still have one, but after that can still do it unlimited times anyways).
Did you already have those higher levels unlocked before ?