In the Kings Gambit, Black does have several different replies
The d5 line is considered good.
Even taking the f4 pawn and trying to defend it with moves like g5, h6, and/or Nf6 to h5.
All these things happen in the Kings Gambit!
In the line we are looking at, It looks like Black is trying to do a Reversed Kings Gambit.
IM Pfren was saying d4 moves which seem similar to the d5 line players play against Kings Gambit (Just with White Bishop on c4).
I do wonder if White has d3 moves Similar to Bobby Fischers Defense!
With ideas of g4 + h3 to follow
It is interesting for sure!
Well, I think that I have surmised that if black is not afraid of white playing f4 and incorporating kings Gambit type ideas, then there are really no sidelines by white to keep black from playing the Latvian Gambit. Or specifically the Gambit name mentioned against the bishop opening.