The latest finalised submission to the Common Lisp Document Repository (confusingly called CDR instead of CLDR) dates from August 4, 2013. CDRs are the equivalent to the SRFIs from the Scheme world. You could argue that they are not THE standard, but they are A standard. And considering the original standardization supposedly cost 400,000 USD (about 900,000 USD in today's money), I can see why there hasn't been another official ANSI standard.
And since the Common Lisp Document Repository appears to have been created in 2006 (the first document at https://cdr.common-lisp.dev/index_files/final.html is a description of the rationale for its existence, dated August 2006) while the Common Locale Data Repository was created in 2003, the Common Locale Data Repository had the CLDR acronym first. So kudos to the Common Lisp Document Repository folks for not overloading the acronym but finding an alternative.
There are also other basic things needed for adoption - standard APIs for database providers, etc