That's... not what I would have expected.
Throne Room isn't playing Feast twice in any case: consider the case of BoM-as-Smithy. Throne Room plays Band of Misfits once; BoM plays Smithy; Throne Room tries to play BoM a second time, but when it looks for BoM it finds a Smithy and it's like, whatever, I guess I'll just play that then. So the Throne Room itself plays BoM once and Smithy once.
But this perhaps is wading a bit too far into the weeds to be useful.
Well it's a real question that wants a good answer.
The question is how Throne Room works; Band of Misfits is def. no longer a Feast in the trash. This question came up during work on the set, and was part of how it got the wording it got, to deal with questions as well as possible, but this question didn't come back up afterwards. I guess there's also, you are saying Throne didn't play Smithy, but that's not clear either. You play BoM as if it were etc. If you play it as Smithy, didn't you Throne a Smithy?
Anyway for the moment let's stick with, you Feast twice, since that was what made sense to me upon hearing the question.
And I will think about it in my copious free time.