Global release wise, both version of Stomp was released back in 2016 and most sellers got their stocks around the following timeframe
May 2016
FT-07 Stomp
Sep 2016
FT-07X Stomp
Since then most major retailers has sold out of both and only the regular version FT-07 Stomp is being reissued (not X), which was announced a week or so ago.
Yes their Ad was confusing given everything shown was for the regular FT-07 version with no mention of X, but If your invoice says FT-07X then could likely be old stock that has arrived recently and like Sinnertwin said should theoretically have no issues getting him.