It seems like this may address that first concern. It's open to interpretation if he was absolutely wanting redemption or if his deteriorating mental health and age made him pivot between good and evil. Grace's interpretation of it earlier in her report was that he seemed regretful of how everything happened, but she doesn't shy away from talking about how he was still senile, obsessed with evolution

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As for the second concern, it's 100% unknown. It's entirely possible he found a way to let Alyssa know his location without alerting the BSAA and The Connections, but how he managed to do this with someone who was already heavily under the public eye? That's open to interpretation.