Like I said in your other thread, there are no free character migrations showing as open for Classic realms at this time outside of the SoM ones for folks who don’t want their character deleted. . That the shop is showing it is likely a bug and should be reported on the Website Bug Report forum. I’m trying to dig up when the last time they actually offered free transfers for Classic realms, but it’s not easily evident. If there were transfers available, there would be a sticky pinned to the top of the WoW Classic forums, but there isn’t one.
Honestly, the last time I saw there was one for Classic (and not TBCC or Wrath Classic) was back in September of last year and Herod wasn’t even listed as a destination realm or to transfer off. I feel like there was one between now and then, but be darned if I can find it. Now, if I’m incorrect in any of this, I absolutely welcome someone else to correct me. But for all of my digging, I’m not showing anything notated about current Classic character migrations.