Science refers to some technologies and methods that people use to transform the world according to objective laws.
Whether yoga is pseudoscience depends on whether it conforms to objective laws.
If you follow the routine yoga practice, you can reach the realm of physical fitness. At this level, yoga is a healthy way of exercise and health care, and it is scientific in general. Because yoga pays great attention to breathing, this is in line with the laws of the human body.
But some yoga in disguise is unscientific.
To sum up, yoga is not pseudoscience, as long as it is operated according to formal procedures, it is a healthy and scientific exercise regimen.