Looks like blatant misinformation to me. As to sources:
* Amazon SimpleDB on Erlang (friend of a developer): http://www.satine.org/archives/2007/12/13/amazon-simpledb/
* IMDb on Java/Erlang (a job posting): http://www.computerjobs.com/job_display.aspx?jobid=2052172
* Gears on Erlang: N/A