You evidently did not read the post clearly.
David is being punished for the sins he commited he has not been condemned to live in outer darkness the final judgment has not been carried out. Like when your parents send you to your room for a short time but you are not forced to stay there forever. The final Judgment on David is that he was to be punished then he was to recieve the lowest degree of glory. so in the end he will be released from his punishment and be given the telestial kingdom.

Meh.... I don't this is going to wash... But it does prove my point! Thank you.

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"I know no method to secure the repeal of bad or obnoxious laws so effective as their stringent execution." March 4, 1869, Grant's First Inaugural Address

What? Eternal is forever but David has not been passed under eternal judgment yet, his is currently temporary. Those condemned to eternal life in outer darkness are those who have faced the final judgement already. (though no one has as of yet)