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Depends on your definition of a cryptocurrency. Libra is a blockchain distributed across multiple separate entities. That fits the definition of a cryptocurrency for most people. If your definition of a cryptocurrency requires community control, then no, it's not a cryptocurrency.

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It's a distributed ledger "distributed" among a permission group of owners.

The real test is if you can just replace it with a database is it still relevant? In this case, you change nothing by just removing the "blockchain" and replacing it with a database server. Same thing with XRP, it's not distributed consensus in any meaningful way and thus is not a cryptocurrency by any accepted definition.

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