I'm not sure, but I don't think that is right. I'll have to do a little checking.
What I do know now, is this:
There was a Boba Fett action figure released pre-ESB.
My assumption was that:
It was initially made because he "appeared" in A New Hope. The release of the action figure was delayed then because the footage was cut.
Then, presumably when ESB was announced, they started to release the figure, with a little addition to the packaging, saying he was a "new character in Empire Strikes Back".