I say no, if you have to find something to stand on it is not sufficient.Bedroom has a skylight and no other windows. The skylight is on an angle along a pitched roof so a step stool would be enough to access it. Do you think that this is sufficient egress?
Maybe if the roof was sloped enough, but I haven't seen one that I would consider a fire escape.You can answer the question by figuring out how a person could escape from a fire. Can't do that from a skylight.
Don't call it a bedroom, the market may or not value it the same as a bedroom.Essentially although it does have its own heat, closet, privacy door, and does not serve as a corridor to access other rooms but no window.
Imo it is not a window because even if someone can open it they would be on a slanted roof top - just stop trying to make it a bedroom look how low the ceiling is just call it what it is an attic dorm room flex space that the owners put beds in for their personal use.