I agree that is a reasonable inference. Yet a few people report no problems with yen transfers and the only complaint so far re yen withdrawals were by joesmoe2012 who complained his withdrawal took 1 week (as opposed to 4-12 weeks for sepa/wire).
The reason for this was an error in the Japanese spelling of his name. His JPY transfer arrived the day after he contacted support and corrected the error. There have been many reports on this forum, even in this thread, that JPY transfers work fine both ways.