The answer is a simple "no". You can't bike for transit "at home". You can't bike for enjoyment "at home". And biking to exercise is a different form of exer

The answer is a simple "no". You can't bike for transit "at home". You can't bike for enjoyment "at home". And biking to exercise is a different form of exercise than riding an exercise bike. Raising resistance is not the same as going uphill. Maintaining your bike in balance and steering/controlling it is not the same as sitting on a static frame. Not to mention, the overall experience is completely different, and that can also matters for reasons related to quality of exercise.