Re: ah
No, no it is not. The abdication is explicit. It's not about the people having more power or putting checks on Polly's, it's about removing Polly from power completely. 100%. No royalty. Phillipus and Artemis are the highest authorities on Themyscira post-CWII. Diana repeatedly and explicitly rejects the "princess" title after stepping down. "Io, please, I am a princess no longer, and an ambassador only to them."
And even if it were, that wouldn't solve the "Polly died therefore she must be queen" problem. Like I said: if there is a monarchy, she has to be a queen.