I'm not sure where you heard that.
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I just took a computer-delivered Step. When will I get my scores?
USMLE Step scores are sent to you by your registration entity - for Step 1 and Step 2, either NBME or ECFMG; for Step 3, FSMB. You must contact your registration entity if you have questions about receiving your scores.
Scores ready for release are released on a weekly basis on Wednesdays. Generally these will include examinees tested three to six weeks before the release date. However, there are many factors that may delay an individual score release. Usually these will be quickly resolved and the score released in the next weekly cycle. If you have not received your score within six weeks of your test date, please contact your registration entity to determine the status of your score report.
Please note that during 2006, no new scores for computer-delivered Step examinations will be released during the week of July 3 and during the week of December 25.
Why does it take three to six weeks to score my examination?
In order to assure that both the processing and scoring of USMLE examinations are done in a secure and accurate fashion, it is necessary to follow a number of quality assurance steps. These steps include monitoring reports from test centers about test delivery problems and about possible security violations. For Steps 1 and 2 CK, these processes are completed for a majority of examinees in three to four weeks. For Step 3, because it is a two-day examination containing computer simulations, the processes are a bit more complex. For Step 3, most examinations are processed, scored, and reported in four to six weeks."
http://www.usmle.org/FAQs/faqusmle.htm