I've been growing Habandas for many years. No question that they are slower than the others. But they will erupt. Just given them time. What is stunning about them is that (at least in my climate) I get two full flushes of peppers. When the first is done, the blooms start to come out again. By the end of the season, with four plants, I've gotten more than five hundred of them. It is well understood that superhots grow more slowly than other peppers, and Habanadas are bred from the superhot Habaneros. See https://peppergeek.com/how-to-grow-habaneros/.

Habanadas grow bush-like so they always look kind of compact compared with the more erect varieties.

BTW, I have many (as yet green) fruits on mine right now, but the plants went in in March. I'll be harvesting my first flush in July.