After another four weeks, The BFDI told Alvaro's office in a telephone call that the request had still not been forwarded to American authorities. There was, still no agreement between the US authorities and the BFDI. The American authorities would require still more data from the applicant. Nevertheless, Alvaro consented to have the data in question forwarded to the American authorities.
While indeed the article is not clear, it seems to me that the US authorities are not providing a mechanism for BFDI (or presumably any other European agency) to request the information that they HAVE to provide according to the agreement. The BFDI essentially says, we can send this info, but the Americans don't really agree it is adequate and don't really specify WHAT is adequate. It does not look like the BFDI was deliberating with itself on what to send, "There was, still no agreement between the US authorities and the BFDI", so the BFDI was communicating with the US authorities to try and get the requirements to make the request. Agreed though, it could be clearer in the article.