In technical terms, RIRs can indeed configure IPs to become RPKI invalid.
Incorrect.
If the RIR revokes the resource certificate used to sign the ROA, the ROA is also then revoked. Validator software will then remove the VRPs that had been created from that previously valid ROA. If there are no other VRPs that cover the BGP message parameters, the validator will return NOTFOUND.
If the RIR refused to publish or deleted the ROA, validators will eventually delete them, which also removes the VRP previously created. If there are no other VRPs that cover the BGP message parameters, the validator will return NOTFOUND.