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CCM in the RUP setting reduced to CTR?

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I have a question regarding the paper:

Andreeva, E. et al, Securely Release Unverified Plaintext in Authenticated Encryption , 2014 (DOI: 10.1007/978-3-662-45611-8_6)

AE schemes such as GCM [28] and CCM [40] reduce to CTR mode in the RUP setting. This is because the adversary does not need to forge a ciphertext in order to obtain information about the corresponding (unverified) plaintext.

I cannot follow the explanation. Which ciphertext would be forced? The one used for CBC? (used in CCM as I understand it's a combination of CBC+CTR) Can someone provide a more detailed explanation of why CCM's security reduces to CTR's security?

I sit in a Tesla and translated this thread with Ai:

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