I think we should be very careful not to interpret the Yoga Sutras Chapter 3 and apologize for the Siddhis. I have seen many authors try to explain the siddhis away as either abilities of the subtle body, as exaggerations or lies by Patanjali. This is simply because they sound too fantastic. Yes, they are rather fantastic, but that does not change change the fact that Patanjali does indeed mention them.
Personally to me, they are not fantastic, because if you read the sutras carefully you will notice that the process for how the siddhis work are actually scientifically sound.
Invisibility: By Samyama on the form of ones body(and by) checking the power of perception by intercepting the light from the eyes of the observer, the body becomes invisible
This is exactly how invisibility actually works. If you can prevent the light from reflecting from your body into the eyes of others observers, you will become invisible. Based on this principle invisibility technologies are now being developed.
Teleportation: By Samyama on the relationship between body and the ether, lighhness like that of cotton is obtained, and thus travelling through the ether becomes possible
This is exactly how true teleportation would work. If we are able to quantimize an object(i.e., collapsing it to its wavefunction state) the object can then enter into the quantum field and be transmitted to any point in the universe. We already know this goes on with electrons in atoms, where electrons can disappear from one location and appear in another location through quantum tunneling. The ether of Yoga and the quantum field of quantum physics are identical, and several modern scientists and philosophers have pointed this out, even calling the quantum field by the Yogic name: Akashic field.
Patanjali was no idiot, he describes the siddhis that one can develop in Yoga because they are real. Modern research in parapsychology confirms many of the siddhis Patanjali describes. Some of the siddhis Patanjali describes are now common knowledge like arresting your thirst and hunger, controlling your so-called involuntary bodily process like body heat and heart beat.