What is "retry time not reached for any host after a long failure period"

Recently one of our customer reported the issue with his emails to yahoo.com and noted the "retry time not reached for any host after a long failure period" error in his bounced emails. It's very possible that the exim database is corrupted, so we run these commands that

/usr/sbin/exim_tidydb -t 1d /var/spool/exim retry > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim reject > /dev/null
/usr/sbin/exim_tidydb -t 1d /var/spool/exim wait-remote_smtp > /dev/null

/scripts/courierup -- force
/scripts/eximup --force
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