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It has nothing to do with the buyer, even if you spent all their money, if they opened a dispute and you couldn't or wouldn't refund then paypal would do so under their buyer protection policy.
The 'new seller' hold is to protect PAYPAL not the buyer. As they have to refund the buyer anyway if the buyer wins a dispute then paypal wants to make sure the seller has a good selling reputation and until then they go through the 'new seller hold'.
Having said that if you are selling on Ebay then.....................
Ebay and Paypal are 2 separate companies and have 2 separate policies for holding funds for 'new sellers'.
If yours was an Ebay transaction then its an Ebay hold and Ebay authorise when paypal can release the funds.
Feedback does not count for payment release.
Normally for Ebays hold funds are released when tracking shows the item as delivered + 1 days (if you use Ebay / paypal postage).
Info in this Ebay link below about Ebays hold.