It's my understanding that the yellow is caused by rest of the plant drawing nutrients out of those fronds.
You aren't supposed to cut them off till they are brown so the plant can obtain what ever it can.
You bigger issue is having a queen survive thru a cold winter, the UF is strongly advising not to plant them in this zone.
they don't die for 18-24 months after the freeze
Landscapers sell them due to low wholesale cost < $100
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